Perhaps it's now hidden somewhere, but I no longer see the search function, which I wouldn't mind having even for a static archive. My typical first operation in looking for a peace of software was to go to freshmeat, do a search, and sort by popularity/vitality.
Variety in open source is wonderful, but unless I have very specific requirements, I often just want to install one of the 'community approved best' options and not worry about deciphering reviews and forum posts to find out what is featured, active, and stable. In my experience, freshmeat was always the best place for that.
sf.net and the ubuntu software center do have some decent rankings. I recently used the later to preload Ubuntu for a friend with software I thought would showcase what opensource can do for him.
What would be awfully nice, however, would be some sort of cross-platform aggregation of statistics which includes downloads from package managers.