We've just rereleased all the Ruby gems (libraries) we use to interface to the various cloud providers. These gems are what we use in our RightScale platform in production, not some stripped-down version. They have performance optimizations and extensive error checking as well as retries for failing operations.
As part of the current wave, we've released the Amazon Web Services interface RightAws 1.10.0. The big new features are SDB's SQL-like query and query_with_attributes support as well as signature v2 support for all services. There are also numerous bug fixes, many of them reported and patched by users and customers. Thank you!
We've also released alpha versions of the GoGrid, FlexiScale, and Slicehost gems. These have seen less production use and the APIs at these providers are still seeing changes, so we expect we'll have some fixing to do. Please report any bugs to us and we'll fix 'em!
We remain committed to contributing open source libraries to the cloud community. Also, by popular demand, we will be moving the development of these gems to a public git repository soon. It's a bit more tricky than you might expect, as we're often ahead on a private branch with non-public cloud features, so we need to make it all work correctly.
Oops: I almost forgot to add a link to the gems: http://rightscale.rubyforge.org/ and http://rubyforge.org/projects/rightscale