Downhill (and the blogging ecosystem, sorta) has an API
Downhill, mentioned a couple of days ago, now has an XML-RPC API. You can also use it to grab little bits of data out of the ecosystem (if you can't be bothered downloading and parsing the whole dataset from the site, or if you don't have a copy of Python handy to do the decoding).
... more like this: [Downhill, Leonard Richardson]