You ARE...

[Delling]

My response... what is it? I may join after it is explained...

[Louisiana Night]

1. It records the music you play

It's elementary! Once you've signed up and downloaded Last.fm, just listen to music through your computer's music player – as you do every day. The name of each song you play will be automatically sent to our servers and saved in your musical profile. We call this "scrobbling," and it's the basis of everything we do at Last.fm, from personalised recommendations to radio, music charts to musical neighbours, and much more.

Over ten million times a day, Last.fm users fuel the social music revolution by scrobbling their tracks. Ready to share your musical insights with friends, family, and the world? It's free, easy, and a lot of fun: go ahead and scrobble!

2. It will then create stats/charts based on this data.
Notice the Top Artists and Top Tracks in this example page. More detailed charts, based on date, are available in the chart section of that page. The Journal section/tab is similar to a blog, but usually deals with music(due to the site's subject matter). Groups are like the TSL Last.fm group, Friends are kind of like contacts in messengers(it's more of a formality than anything, I don't think there is any actual change in status), and Neighbours are people who share your musical tastes.

3. You can join groups with similar interests to you(usually dealing with some sort of music). When it has 15 active members, the group gets its own online radio station(which requires broadband ). This includes stats/charts for the group, and a group message board. Example Group

4.
Then there are some nice "extras" like being able to put your chart(s) in your signature, on your website, or wherever you find to place the code.

Do you want more details?

[Delling]

nah, that's good enough

I'll join later... *messing with compie stuff at the moment*