I've spent some time writing a twitter client in python. it works on the n810 and the n900.
I wrote it as a learning exersise mainly. however I have started using it as my main client.
i've been thinking about making it availiable, but that seems like a lot of effort to go to if no one is interested.
so, here is what it can do
basic auth only.
retireve your twitterfeed
tweet
twitpic
open referenced urls from tweets into browser
also there are views for
mentions, direct messages, public timeline, friends, trending topics
and there is a search option.
it's all pretty raw, and I'm not going to pretend it's even remotely well written. but if there is interest I may clean it up and figure out how to get it into the repositories etc
I've been using Witter quite often since it hit extras-devel. It is a little rough around the edges, but I think it's a good start. Please keep developing it!