The client currently reports how many blocks I have downloaded, but it would be useful for the client to also report the total number of blocks there are. That way I wouldn't have to check a website to see if my client has all the blocks.
the qt-client does.
Also it would let me know about how long I have to wait before I have downloaded all the blocks.
it also has a progress bar, but not a time estimate. with the newer clients its rather quick though (something like a minute per day or so), so much less relevant.