If you ask for comments, make sure your comment system doesn't break. I hadn't noticed the permission problems after moving the cgi to /var. It's fixed now... sorry about that, folks.
In the meanwhile, Ross and I agreed on IRC that suffixes are bad, and I got rid of them entirely. He also told me about the py['defaultFlavour'] config option, which I hand't found, everything is ok now (well, except for the content_type vs. IE problem which I still need suggestions for).
Update: James pointed me at a nice post on blog URLs.