I don't know... but seems to me somethings weird, I seem to have alot more updates, alot less space on phone and more trouble downloading updates, for example, launcherpro and another app have been on "Downloading" status for a day, while if I click on Update on another app, it goes right ahead and downloads..
Users still looking for a way to manually install the market update should checkout this article How to Manually Update Android Market | Eugene O'Rourke. It gives steps on how to update the market through recovery mode that worked well for me.