I've recovered most of my old Dumpshock TzeentchNet page and reposted it at http://tzeentchnet.pingslave.com/
This includes many articles that were basically "lost in time" for several years, like the Shadowrun <--> Mekton rules, my rants on "Power Factors", reverse engineering laser weapons, etc etc. I've also dramatically updated by old links page with lots of new stuff that will be useful with the more "neo-transhuman" Shadowrun 4e. None of the rules material is 4e at the moment. I have the books but am too busy with GURPS stuff at the moment to get my feet wet in the system.
Only two files were unrecoverable - the old Matrix deckbuilder software (I can get another copy of it if people want) and the Rigger 3 additions (tandem triplane layouts and so on). I'll probably end up revamping some of the cut material from the SONA Tir Tairngire /Salish-Shidhe into a 4e form when I get some free time since it doesn't appear to be entirely OBE in the new timeline.
Shadowrun Material: http://tzeentchnet.pingslave.com/Various.html
Links of Interest: http://tzeentchnet.pingslave.com/Links.html
Kenneth