I like rounders for content (
tuco is one of the hosts) and pokerwire for entertainment.
EDIT: that's not to say that rounders isn't entertaining, but they are canadian so you have to take that into consideration.
other stuff I subscribe to:
NPR: All Songs Considered
The Official Lost Podcast
ESPN: PTI
(mini-hijack - looking for others to check out if anyone wants to suggest something)
jHE