Separate names with a comma.
Microsoft has SkyDrive as well. I think you need a LIVE id:
Windows Live SkyDrive - Online document storage and file sharing
You can try Office 365 as well (online browser version). It used to be free but it looks like they are charging now.
Not really sure
Not really sure what you mean but you can either access Gmail through the browser, add the gmail account to your email settings,...
Have you tried XBMC? Kind of off topic sorry, but it's awesome for music management and it has a bunch of cool features (like scrapping...
Not sure about straight to the Kindle app but you can transfer using Dropbox.
Transfer your files
You can definitely transfer all your files quite easily using Dropbox.
Check out my blog (sig) for more info...