When an XML-RPC WordPress client uploads a photo, this plugin add the URLs for the resized images to the response so they can be used by the client in
As I write this, it hasn't been released yet so: not right now. I plan to add support to MaStory for Maemo mobile phones.
Is WordPress generating thumbnails at all? Look in the same directory as the image was uploaded. If not, the problem is unlikely to be this plugin (it just sends the URLs back, it doesn't alter the image generation which WordPress already does).
I've encounter two problems that stop WordPress generating thumbnails: