Not sure how many of you will have noticed this so here is
MUSIC MIX in Messenger!
How To Use It:
1) Open a conversation window
2) Hit “activities”
3) Select the second one down: Music Mix
4) When the play list opens, add tracks to it and jam away…together!
Details:
Remember – you’re sharing a play list. If you fastforward, skip, or stop a song, your buddy will hear the same thing you do.
Songs are not actually transferred to your buddy, only a compressed version is temporarily cached on their computer while you mix.
Playlist file formats are wma, mp3, & wav
Music Mix holds up to 25 songs at a time, each a max of 20MB in size. You must delete songs to add more
Album art info is shown at the top of the activity window only in the US, but obscure songs can sometimes show the wrong album art.
the Search button only shows up for songs added by your buddy, clicking it will take you to an MSN Music search for your song
Requirements:
Currently only available in the US, France, Germany, Japan, and the UK.
Requires WMP 10, which is available for Windows XP and up.
Now available on Windows Live Beta, but VERY SOON MSN Messenger users will see it show up in their activity menu as well, so keep checking it
taken from Inside Windows Live Messenger blog