“Groovy Motherfucker”

Crazy smart security and caching system for websites. You repoint your domain’s DNS to their servers, and everything gets cached and filtered automagically. Comment spam has almost entirely disappeared since I installed it on my blog.

Handy open source tool from Google to analyze DNS servers and see if it might be worth switching away from your ISP’s default.

Attackers could theoretically use DNS rebinding to use your computer to connect to anywhere — Even internal sites. I’m skeptical that this is a “big” problem — the hurdles that an attacker would have to leap are numerous — but it’s an interesting approach.