I just finished a game and went to start another, and never got matched with anyone. I kept trying and now the countdown timer for going into matchmaking just freezes. Also, Bungie.net took forever to load even though my internet is fine and many other websites loaded as expected.
*EDIT*
This problem seems to have been fixed. Thanks for the info Achronos!
[Edited on 04.02.2008 5:55 PM PDT]
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There was apparently a problem in the datacenter that serves some your Xbox Live presence information. Bungie.net is hosted in the same place, so it was affected as well.