Such is tracked on the jailbreak sites.
Yes, this is a dumb question, but I know that the impending 1.1.2 iPhone and Touch update will screw all of the jailbreak apps, but will 7.5 and 7.3 prevent hacking also?? I haven't upgraded yet, but I haven't used iJailbreak yet either, and I may do so in the future. I'd prefer that option available to me even if I don't use it right now.
-BMF

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic