Hiya,
Just make up a spreadsheet.
Save it on officelive then you can designate who has access to read and who can modify it.
It will be available via the internet to anyone you authorise.
Quite easy to use once you have played with it for 10 mins.
I have used it to transfer quite large documents and to run a project with 5 different authors/editors on opposite sides of the planet.
Best of all its free.
karl.