I have enough to play this holiday season as it is, so I can't imagine what it'd be like with the delayed games adding to the crowd. I'm fine with delays when they can help give a developer more time to refine or fix things, but not when it's just delaying the inevitable for a bad/mediocre.
I don't remember Darksiders having a release date other than January 1, 2010 and being pushed back four days isn't really a big delay. I'm guessing GT4 is supposed to be GT5, but that never had a 2009 release date, just a lot of assumptions and rumors that it would be out this year.