they call it web 2.0

I call it juice. When the effort is really minimum (i.e. you don’t waste more than 5 minutes, you click only 2-3 times) and you produce something like this:

This is Web 2.0 Juice. I’ve installed some time ago the iScrobbler app on my Mac, now I’m happy to share my listening on last.fm. [hei windows user, don't worry, looks like there's also a client for windows...]
What other Web 2.0 Juice? Flickr, I love especially the “send to blog” functionality: very easy and immediate. I like a lot Gmail and I use it a lot, with Mac Mail, from the web, from wap, from their good MIDlet.

I still didn’t found any other so good service like the above ones and since there’s no sharing/communities ideas behind Gmail the good 2.0 juice are only last.fm and flickr.

Now I understand why is called 2.0, they are only in 2
Important update!
The iScrobbler link is wrong, it points to the old iScrobbler project, the updated, correct one is this: the version here is the 1.2.1, this works! Thanks to Luca for the double check.