If you want to create covers for your CDs and DVDs that are professional and easy to do, then what you need is a program called CoverXP. This is an editor for CD and DVD covers, although you can set the size. But don`t let the name deceive you as it is compatible with all Windows systems.
CoverXP has an impressive range of features. For example, you can open a cover or image you want to use as a cover from your PC, and the program will elongate it to the right size for your printer too. It supports more than 300 file formats, including JPG, PNG, BMP, GIF and PSD. It has support for pre-cut paper sizes but also has a custom paper mode. You can preview and zoom in and out, get images directly from a scanner, webcam (TWAIN compatible) or use CoverXP's download mode to get covers directly from the Internet.
CoverXP can also be accessed through other applications via the command line. It has a multitude of printer adjustments and you can use custom texts for the spines. It also offers a mirror feature, plus the usual flip and rotate. Finally it has a split mode to make sure you can use and edit two different images, one for the front and one for the back.
So there you have it. If you want a really professional program to produce very high quality anti-aliased images for your covers, CoverXP is what you need. And it's free!