SimpleDB PHP class

I'm writing a PHP class to interface with SimpleDB via REST (rather than SOAP).  It's usable now, and I've registered a SourceForge project for it.  The SourceForge project can be found here:

https://sourceforge.net/projects/php-sdb

I will be adding features as quickly as I can come up with what to add, so feel free to post feature requests here or on the SourceForge project tracker.  The source code can be downloaded from the project's Subversion repository.

My SimpleDB class is based on Don Schonknecht's S3 PHP class, which can be found here:

http://undesigned.org.za/2007/10/22/amazon-s3-php-class

The two classes are designed to be used together, as they have similar interfaces, both internal and external.