My experiments involving the social graph, aggregation, data portability and MP3 search continue. I've now got my Imeem just played feed automatically producing MP3 search results as well. Unfortunately, I don't yet see a way to easily get your Imeem UserID from your username/login info... so it's not really user friendly for anyone else at all at this point since I had to manually dig mine out and hard code it. Regardless, I've added it to my lifestream and it seems to be working as well as the others.
Unfortunately, Soup.io (my current publishing platform) nor Tumblr seem to be able/want to keep up with the feeds. That being said, I'm also pushing my aggregated MP3 stream to some other lifestreaming services that seem better equipped to keep up. FriendFeed feed seems to deal with it pretty well (http://www.friendfeed.com/jherskowitz). And while Lifestream.fm (http://lifestream.fm/jherskowitz) won't embed a flash player in the stream automatically like FriendFeed and others, it does have a cool feature (powered by Beam-It-Up-Scotty) that lets you send links via SMS to anything in your or others' lifestream(s). So if you see a song you like, you just "beam it" to your phone, click on the link, and listen to the track stream over the air. Pretty cool.