Have you checked Android Market on your HTC EVO 4G today?
If not, then I hope you said goodbye to the Downloads tab when you last saw it because it's not there anymore. It's been replaced by a Sprint tab that lists apps that aren't even directly affiliated with the carrier. Downloads got moved to the Menu.
It looks like the automatic change is being rolled out slowly today because when a friend in Texas told me about it earlier, everything still looked the same on my EVO. About an hour later, however, just as I was trying to take a screenshot of the original market, the change happened with no warning.
I always liked the Downloads tab, as it provided one-tap access to a list of all the apps I've downloaded and let me see which ones needed to be updated (albeit individually). Now we need to tap Menu -> Downloads just to see the same thing. An extra tap isn't the end of the world, of course, but pushing the list into the Menu for a tab that adds no value to the Market experience is annoying.
Two more screenshots below.