I use 2 meathods to resize my photo's. I don't set size on my camera, partly cause I didn't know there was an option to do so. Giggle.
1. (Resizing before I upload to photobucket) I open a photo in Microsoft Office Picture manager>click edit pictures>click resize>click dropdown arrow and choose either "web large (640x480)" or "web small (448x336)". Then click ok and save or save as if I want to keep one with the original size.
2. (Resizeing in photobuck) click on photo in album. There are different options to get to reszie, but I usually choose edit, then resize to above mentioned dimensions and save replace or save copy.
I also use picasa web which when resizing I use similar above mentioned options.
Hope this helps.