Just to increase the score for python and Python apps for the Zaurus...
Here's a little app I designed as a Flickr Viewer for the Zaurus.
Its still a work in progress, so be patient with features.
Allows to view photo groups, photos for any users.
Able to view by Flickr NSID or by Username.
I haven't implemented the Flickr Authentication API method yet (since that requires a browser login, and I wanted a self-contained app).
Also able to view photos by "Interestingness" in Flickr.
Able to store photos to local disk for offline viewing (no photo titles or tags in offline mode). Can delete local photos to clear up memory space.
Plan to implement searching by photo Tags, most Popular Tags.
Search by email ID etc later on. Ability to change settings etc.
Also implement Authenication so as to allow read/write access to user Flickr account.
That would include upload photos to Flickr from Zaurus.
Python (tested with Kopsis Python) on the Zaurus.