Since we have been talking about Cloud Services, one major area is cloud storage.  Where to store your documents as well as all other related data requirements.  To get a review of the current offerings from the big players take a look at ScottW's blog post.  He does an amazing job talking about all of the options for these services.  You can also find .NET code releated samples to many of the services on his blog.

ScottW's blog post: Cloud Options - Amazon, Google, & Microsoft