You can set up environments and edit documents, etc. using Cloudshare Pro (pretty responsive but not Mac ready), but unfortunately, the instances last only 15 days. You can import and save documents using FTP on these virtual machines. You can customize the environment if you wish. The site is for IT departments to demo integrated PC environments.
They do not appear to have an "Environment Rent" plan where you can pay as you go, so your elaborate environment has to be recreated every 15 days.
It is pretty surprising that nobody appears yet to be renting instances with "Microsoft Office" and a couple of other essential programs included with the option to install your own. It would be a great alternative for Mac Users (like me) that occasionally need to use a PC on the road (use VMWare at home) or don't want to have to install VMWare on every Mac I have (8 and counting).
Chris Wells
Tokyo, Japan