[nmb]

Tipfy is nice, but its documentation is horribly out-of-date. The last time I tried using it, I had to dive into the source code several times to figure out what was going on. Eventually I ended up moving off of app engine. (I considered contributing to the docs, but I would have had to spend a lot of time learning the codebase as parts of it had been heavily restructured since the docs were last updated.)