Equipped to Survive is one of many great survival sites. Personally I LOVE gathering info, books, tools, etc. for survaival kits and just every day pieces of gear that come in handy.
Another favourite of mine is Ranger Rick's Digest, chock full of simple, cheapo tricks, techniques etc. that many of which would be gerat for airsofters. How about a Dollar Store phone cord extension for a cheap pistol lanyard? What about a poor man's BBQ, made out of a piece of grill and an old ammo box? Hehe, prime one to read is how to dry your combat boots in the dryer without all that banging around noise!
http://www.therangerdigest.com/