ubikon remote desktop
I tried ubikon. What you get: a KDE desktop you can connect to from anywhere. What they get: nothing. Maybe in the future they will put ads on the desktop or something. If they don't find a way to make money, I guess the fun won't last long.
The site feels a bit messy and unpolished, but I don't mind that. After requesting an account, you get emailed a password and instructions to download a freeNX client and a wrapper script. The client I downloaded from there didn't work on my archlinux, but it did leave some configuration files in my home directory. I installed nxclient myself and figured out the incantation to use is:
/opt/NX/bin/nxclient-nomachine --session .nx/config/ubikon.nxs
After a while, I was greeted by kubuntu. Again, it is rather unpolished. OpenOffice is installed but doesn't appear in the menu. The speed is more than decent, though. The GIMP is also installed, and firefox and who knows what else.
Moving files to and from your ubikon desktop is done through ftp.
Conclusion: this is cool. It's an easy way to show linux to windows users, it's an easy way to have your unix tools available in a windows-only environment, and it's cool in general. Downside: you really shouldn't use this for top secret files, and of course most of your files are top secret. A more secure tool for the same job that works in a completely different way is the black dog, but that thing isn't free.