I realise this is taking things a bit off-topic, but:

If you fancy a bit of Eclipse-based Python editing for Maemo 5, then you could do a lot worse than trying out the Pluthon project at

http://pluthon.garage.maemo.org/2nd_edition/

When fully set up, at the click of a Run button you can shovel all of your Python project onto the N900 and have it run it for you automatically.

It requires a fair bit of setting up to get to that point, though.