SproutCore and Tatsumaki
I added a Perl backend version of the SproutCore tutorial to the wiki. It was useful to see how Tatsumaki (the new framework by Tatsushiko Miyagawa) worked, and also because PSGI is quite fun to use!
I followed through the POD for Tatsumaki to get an idea of how the various methods (put, get, post) would have to be implemented. Some things weren't quite clear, and had to reach the source to find out, for example, exactly how to set the HTTP response code.
All in all quite a fun experience. Please do read it and feel free to modify it and give feedback via the comments!