Funny, but I don't recall Yglesias demanding those changes while Democrats were in the minority in the Senate.
There's a similar note below about liberal hypocrisy. For whatever's it's worth, it should be noted that Matt is actually on the record as opposing the filibuster back in 2005. I'm not totally convinced because I haven't thought much about what a filibuster-less world would look like. Still, at least in Matt's case, killing the filibuster isn't a new argument born out of the current congressional make-up.
UPDATE: Had this as an e-mail. It was Ed Morrissey. Fixt.