You'd have to change your list almost weekly if you were to put together one of all the cloud computing platforms.

Andy Hu put together a list that includes more than 50 platforms across multiple programming languages and frameworks. It has been updated multiple times, as has Roch Delsalle's list of PaaS.

For our purposes, we thought it would make sense to start with one category and in weeks following look at platforms across other programming languages and frameworks.

Let's start with Ruby, which has some of the deepest roots in the platform community.

What do you think?