A friend and I are keeping each other motivated to lose weight by tracking our progress using a shared spreadsheet. He was emailing his figures weekly and I was uploading them to my webspace. A bit clunky I think you'll agree.
Been having a play with Google's new Docs and Spreadsheet function. I have to say I am very impressed. You can upload, share, collaborate, edit, print etc all online. http://docs.google.com/
It accepts excel formulae etc and whilst it can be a little slow to update (maybe 10 seconds to input some values and see your formulae update) I am totally won over by how well it works.
Had a quick play with the word processor and if I were still a student working on a group project I would be smacking my course mates around the head with it.
Nice one Googlesens.