Yep.. it will be possible to scale images with my MaemoFlickr app. Though it will not be a image editing application. I'm using the Python Imaging library (http://www.pythonware.com/products/pil/) and that can also be used from command line to crop, rotate, scale etc. images.

I just noticed that there is a bug in the script included in PIL that prevents resizing images. I can fix that and post some examples how images can be edited using PIL later today.