First of all, Canola is fantastic—thanks! Now that I've been using it for about 5 months, I thought I'd make a few suggestions.

Photos:

1. In thumbnail view, the left/right of the dpad should move 1 screen in the corresponding direction
2. In full view (black bg mode), you must use on-screen buttons to rotate a photo. If up/down on the dpad rotated the pic clockwise/counterclockwise, then I wouldn't have to tap the screen twice.
3. Also in full view, the +/- buttons (on top) could be used to zoom in/out
4. How about a settable preference for autorotating portrait oriented photos to better use the screen?

Podcasts:

1. I'd like to specify a folder to scan (in addition to the podcast feeds) so that individual podcasts that I download could be grabbed automatically.
2. I'd like an ordered list of my recently played podcasts and/or a list of podcasts that I haven't played to (or skipped to) the end. This way I could better remember what I was last listening to yesterday.
3. It is too easy to accidentally hit the forward/back buttons or skip to a different part of the track and lose your place. It would be handy, perhaps, if after 10 seconds of inactivity you had to tap something (like the album art) in order to "activate" the other controls.
4. [Bug] Sometimes when I "lock touch screen and keys" (power + center button), Canola thinks I've pressed the center button to play/pause the audio. That click should be ignored...