If you got a link you want to share feal free to add (keep them clean).

http://www.linkedresources.com/tools/encrypter/encrypter_v0.2b1.html#top - text encryper (works grate)

http://world.guns.ru/main-e.htm - info on tons of guns (very detailed)

http://www.thehomegunsmith.com/ - DIY guns (worth a look)

http://www.armourarchive.org/essays/ - midevil armor plans and DIY metal working tools

http://blog.makezine.com/archive/2006/03/100_rebreather.html - DIY rebreather (looks iffy)

http://homepage.mac.com/cheethorne/Palladium/hthcombatactions.htm - Hand-to-Hand Combat Actions

http://www.johnstonsarchive.net/nuclear/nuclearwar1.html - The Effects of a Global Thermonuclear War