Hi Rebekah, and firstly, welcome to Dumpshock!

I'll try my best with your questions, but in some cases you should check with your GM as each GM is their own little island of interpretation.

QUOTE (RebekahWSD @ Jul 18 2009, 10:18 AM)

1. I'm playing a pixie shaman (according to the gm, if we bought the book, we could play it. And well, pixies are just so...cute...). I had the help of an experienced shadowrunner in building the character, but I was wondering if there was anything in particular I should have remembered to do special.
Depends what you want to do with your pixie. That's a useless answer but it's the only correct one. But in the interests of being useful here's a few ideas:
Have you done everything you can to ensure you don't get swatted like the pretty little mayfly that you are? E.g. good ranks in Dodge, Perception, Agility? If a magician, have you considered the Deflection spell? Also, unless you have Body 1, then you can still wear Armour Clothing. Have you considered buying some with the Ruthenium Polymer modification from Arsenal (pg. 50). This will make you even harder to spot, plus you'll look so dinky in your little armour clothing infiltration outfit.
QUOTE (RebekahWSD @ Jul 18 2009, 10:18 AM)

2. My concealment power = invisibilty? I wasn't sure when I read the power exactly how it's hiding me, do they just get negatives on their perception pools to see me? If I have concealment on, but am flying around in peoples faces, are they going to see me, or do they have to make a perception first? It hadn't come up much, since I've usually been flying near the ceiling, and no one looks up. Also, I bought a power focus, which if I'm reading the rules, says it adds its bonus to any test involving magic, and concealment says it's based off my magic, do those dice add to it?
Concealment is more mystical than mere invisibility. It can cloud people's minds, if your GM chooses to interpret it that way. It was originally a spirit power so it could be all sorts of natural effects from convenient mists to strangely convenient shadows to actual changes in your appearance. As a pixie, I like to picture it as something very fey. They see you, but they see an Art Deco lamp, they hear your chittering wings or laughter but it's just a large cicada. If you've seen Pan's Labyrinth, think of how the girl walks right past the fawn at first until he suddenly moves, or the way he retreats into the shadows. Or better, how the big insect unfolds to become the little faerie. Your GM will have his or her own take on it, but that's how I see it.
In game terms, its less ambiguous. Concealment is subtracting dice from the victim's Perception dice pool. If your pool is reduced to nothing, then you really can't see what's right in front of you. But keep an eye out for dice pool modifiers. If you're doing something obvious, then a GM could grant a dice pool bonus to the target. Though likewise, you can earn yourself some of your own bonus dice pool by behaving more sensibly. Oh wait - pixie.

You don't normally need to make a perception roll to see the obvious, so you should still try and actually hide. A GM would be within their rights to say that if you were mooning a security guard right in front of his face (bad pixie!), then they'd see you because you weren't actually trying to conceal yourself, same way as if you paint yourself orange and run screaming through the compound, you're not
actually making an Infiltration roll. But if your magic rating is high enough, you can more or less "hide in plain sight", yes.
With regard to the Power Focus, no, by RAW, it will not help you with Concealment. It only adds its rating to
tests involving your Magic rating, not actually boosts the Magic rating itself. There have been a few cases along the same principle which were ruled out by devs on the same lines. You could buy your GM some chocolates though - they might let you get away with it.
Note that you might want to pick up the Extended Masking power some day in order to help hide that focus. Also, you may run afoul of Wards, which would block active foci.
QUOTE (RebekahWSD @ Jul 18 2009, 10:18 AM)

3. How does creating unique enchantments work for most people? My gm is doing it as a side-story miniquest with me going on an metaplanar quest, but I was wondering if there was any normal way of doing unique enchantments, or are they from their very nature, well, unique?
Your GM is handling it aright. Some GM's demand special quests just for obtaining the components to any old foci your character tries to create. For unique items it is entirely appropriate. And anyway, it's fun and you get karma, so say thank you to your nice GM.

QUOTE (RebekahWSD @ Jul 18 2009, 10:18 AM)

4. This is more a fluffy question, but well...in my absorption of the books I have read (The core book, magic book, companion, the rigger's augmentation book, and the hacker's matrix (?) book) I've come across this mention of Arcology. Now, I know from an outside point of view what an arcology is, but the book only mentions that one of the corps learned from it's failed arcology experiment, and one of the chapter starts is from the view of a girl trying to leave an arcology (but no mention of why, who's arcology it is, etc). What is with this Arcology? I asked the gm, and he thought I was insane. I also asked the street samurai (the person who helped me build my character), and he doesn't know either. Please tell me I'm not insane!
An arcology, as you've probably read, is an entire enclosed community, traditionally pyramid-shaped. There are two notable ones in Shadowrun cannon. One is the Aztechnology pyramid in Seattle. Runs in there are a good way to get yourself killed double-time. The second and more famous (and undoubtedly what is referred to as the "failed experiment" and probably what was referred to in the Unwired opening fluff), is the Renraku Arcology. This was one of their flagship projects, located in Downtown Seattle. Larger even than the Aztechnology pyramid. It went into shutdown - nothing getting in, nothing getting out - during the Reraku:Shutdown adventure arc. This was a result of Deus breaking free. I don't want to go too much into this because I (a) don't know all the details and (b) your GM might have a different take on things (in my game, it's still a Renraku installation). In cannon, it is now known as the ACHE (Something Community Housing Something), owned by Seattle City Council and the most boring place on Earth to live.
Hope all that's useful,
Peace,
Khadim.