My Setup(WIP):
[Development]
Platform: Arch Linux running Musca
Language: Python 2.5.4
Libraries: PySide*
Editor: Vim with MiniBufExplorer, TagList, pythoncomplete, VimPDB and TaskList plugins.

[Testing]
Platform: Nokia N900
Deployment: Copy code to N900 via scp, then run remotely using ssh.

[Documentation]
Qt Documentation
Python Tutorial
PySide Online Reference
Vim as a Python IDE

[Screenshot]

• While I realize I can technically run vim on my N900, its far more efficient to type with all 10 fingers rather than just my two thumbs. Also, since I'm already developing code remotely, it makes more since to launch via ssh rather than taking the extra step to open xterm from my N900. I also find the lack of man pages on the N900 annoying.
• While I understand that GTK is "standard" and Qt won't be ready for "prime time" until Maemo 6, I can't stand working with GTK. I find Qt far more flexible and elligant.
• Having said that, I would have gone with PyQt, except that it doesn't currently support Qt's Animation Framework. Plus, it has a fairly restrictive license.
• SCP is part of SSH, which is why they link to the same page
• I have yet to find a suitable colorscheme, which is why omnicomplete looks so ugly :-(

I'll be updating this post when my setup changes instead of re-posting.