IrfanView is the best basic image manipulation program

Version to use: 3.95

Most cameras include their own software and there are many other "album" and editing programs out there. They all suck. IrfanView provides a simple interface, includes things like a powerful batch image convert/rename program that can pull EXIF data. You can also use it to make slideshows. And of course it includes all the basic things like rotating images. Basically, it's awesome.