So I've made a bunch of sprites of a game charater in a walk cycle, and now have 19 files, each with one frame of the animation. Does anyone know a tool that can automatically take all these files and output a single image with all the sprites nicely lined up, ready for use ingame? I should preferebly (sp?) have control over the size of the resulting image, or atleast get a power-of-2 so it can be used as a texture.

Might be quite a few but a simple one is glueit. It simply takes an ordered list of images and outputs a single image which is (width*number_of_images)*height.