Too Many Playlists!

With the sort-of demise of Muxtape, there has been no shortage of playlist tools hitting your local internet lately.  I decided I just didn't care enough to try out all of them, but I was curious if any of you have tried any of the following:

• Tumbletape
  Scans your tumblr blog for uploaded MP3s and makes an instant playlist out of them.


• 8tracks
  Looks pretty similar to Muxtape, but somehow with a worse name.


• Playlist.com
  Reminds me of imeem in terms of its whole "social" vibe.
  
  
• Sonific
  Shut down in May 2008 before I got a chance to really play around with it.
  
  
• Favtape
  Makes mixes based on songs you've tagged as a favorite in Pandora or Last.FM, and lets you make mixes based on a search.
  
  
• The Hype Machine
  Not really a "roll-your-own-playlist" tool per se, but rather a really bad-ass music blog aggregrator that lets you stream tunes that are being featured that day on a huge range of music blogs.  Also lets you search by artist, tag favorites, etc.
  
  
• Elbo.ws
  Very similar to Hype Machine, but with a totally different name.
  
  
• Meemix
  Very similar to Pandora, but with a whole Facebook-esque social networking section (similar to imeem in that regard).  More of an internet radio station in some ways than a playlist tool, but you can make playlists on it.

Did I miss any?  Yes, undoubtedly tons.  The real question is: are any of them worth checking out?  You tell me.