Well, if you upload something onto skydrive, you can access it from any computer anywhere. You don't have to install "skydrive" on the client machine like you would for DropBox.
I just read on Dropbox.com that you can access files on their website and no need of installing software on the client machine. But it's only for 2gb, Skydrive gives much bigger storage room.
Wasn't aware of the 100mb limit, that's a good catch. Thx.