Let week , I was trying to find dropbox alternative. I am using Dropbox and it arrive 14 GB. So, I couldn’t not use in Office. So, I decided to use another one.
I made the comparison table of popular cloud storages. You can check at http://saturngod.github.com/cloud-storages-compare/ .
For my point of view, Dropbox is the best. I choose Box.net for alternative because I got 50 GB promo from dropbox.
I prefer Skydrive because of Office online. If Skydrive give 25 GB free to me, I will definitely chose skydrive.