I'm afraid this is the first I've heard of a "txt" flavoured Blosxom. Try dropping the "/+txt" bit from the end of the URL.
It’s the first software written by me which has entered the Debian repository as its own package (since pum is included in the package pisg which is in testing now for a while) as well as the first software debianized by me which reached Debian Unstable.
Things are always exciting when they happen the first time. ;-)
Thanks to Myon for sponsoring the package.