Adobe PhotoShop Elements 2.0 is a pretty good program, as is Paint Shop Pro 8. They cost just under 100 dollars each. You might download IRFANVIEW from the internet FOR FREE too. Irfanview is an amazingly powerful program when you consider it IS NOT a trial or evaluation version. It is also simple to learn. Picture-It, as mentioned in another reply, is another good program that costs less than PSE 2.0 or PSP8 but it doesn't seem to be as good a program.
By the way, Ifranview can be downloaded from http://www.ifranview.com