One of the things I both love (and sometimes hate) about Shadowrun is the amount of bookkeeping that can go on with any given character. Depending on the type of character, you can have weapons, drones, vehicles, spells, adept powers, complex forms, programs, implants and more to keep track of.
So what character sheets do most people tend to use? The 2-Page from the book is nice, but it really doesn't have a TON of space. And while multiple-page sheets are nice, they can lead to a lot of paper flipping at the table. And not all of us are so lucky as to have a laptop or other device at the table to keep our notes and such on.
There are a number of good sheets available here.
Also, I used to have access to a great weapon sheet that had room for 4 or 5 guns, and even had an ammunition tracker. I would love to find this bad boy for my new merc character, who has 27 or so various boomsticks in his collection.