Comments and blogs
Over at Geekyinfo I point out this wonderful sounding web app that may be the next big thing in blogging circles. It solves a common problem when you are attempting to participate in blogging conversations. That is: what threads and what blogs did you comment upon. This web app will keep track of it for you.
It is in beta at the moment but you can signup to be notified when they release the software to everyone.
Read about it over at geekyinfo.