I think my favorite section of the forum is the Patricia Clark Memorial Library. I've discovered countless books there, including books I never knew of. I believe here is where I also first heard about calibre.
As far as improving that section, maybe if the ebooks were sectioned according to genre. I know each new upload is categorized, but they are all lumped together, if you will. If not that, perhaps a way to list the latest uploads. Don't know if either one is feasible, and neither is a big deal, but since you asked for suggestions, those are mine.
I have another suggestion, but I hesitate to suggest it until I look around to make sure you aren't already doing it.
Happy birthday and keep up the great work!