x The ability to merge in a tex file. That is, allow me to download the tex file from your server, and then send you a new version, obviously you'll track changes.
x EDIT: Bibliographies. Having a single point to place bibtex style bibliographies, and manage them. That would be amazing.
x I don't like that the user login persists at the top of the screen. The UI needs a lot of work, i imagine you're working on that.
x if tex compilation fails, highlight it in red. If it succeeds highlight in green.
x On the file list, next to the .tex file, show the most current pdf file. Ahh apparently you do, you call that view. I don't like that word. I think you should show a.tex a.pdf. View makes me think that you view the tex file.
x Can we upload images? If you're clever, you might be able to figure out a way for figures to be grabed from a url within latex.
x Add some simple templates. When a new file is created, it should have a skeleton that produces a pdf file. If you're on a mac, take a look at texshop.
x Add the ability to jump to the error in the .tex file, this is hard to do apparently, but texshop figured it out.
good work.