Well – now things are really starting to look good! I’ll give you a picture:
Latex – integrated into Google documents – compile in the cloud and export as pdf. I mean – that’s all I ever do in LaTeX! The guys at latexlab.org has really putten together something here that may prove to get a lot of attention. It has managed to seamlessly integrate the solution into Docs, and files are stored in your account. Currently I think they are still in beta, but hopefully a stable solution will emerge soon.