Twitter 2.0

It's an interesting and potentially useful way of broadcasting what's important/interesting to you. Some may use it simply to have a presence on the net, while others let their audience know of information that may benefit.

Librarything 2.0

It is an interesting application but, I'm not enough of a reader to get that involved. I started a similar application on Facebook and haven't continued with it.

Sittin' on the Doc...2.0

Google Docs is a useful tool, since Apple no longer supplies (much of) a free word processor; and for committees sharing data, it is also handy.

Day by Day by Day...2.0

I am intrigued by Scrybe with all its great reviews but, it is so popular (it seems), the creators have paused on adding more users. Yahoo's calendar is convenient but, I am not mobilely connected. I will continue to rely on my paper daytimer.

Youtube, flickr 2.0

...just ways to watch motion and still pictures for entertainment, or more? Justin Bieber would likely disagree.
Beyond the obvious there is (probably) a demonstration for anything you can conceive-cameras to bomb making (!) to one I found useful: making a gong stand.
Flickr has an amazing array of photos and applications for altering them-again, great for intertainment and information value. You can see (and learn from) others' photos or share your own.
More useful tools...

RSS 2.0

Bloglines: what a collection of interesting information! Now I have access to all sorts of data caves. There seem to be several ways of signing up for feeds and (after rereading the instructions (!)), I found one that works. This could be a good way to keep on top on what's going on.