How to create 2d animations and put them into a spritesheet so that you can use in your XNA game
If your doing 2d animation, check out Toon Boom Animation Pro (PLE). PLE is personal learning edition(free trial). Use it to create your animations and then you can export your animation as images using Export --> "OpenGL Frames" option. Once exported, you'll probably want to use
GlueIt to stitch the images up into a spritesheet and your spritesheet will be ready to use.