Free Photography Software
Almost all the functionality of Adobe Photoshop, but free!
Same as the Windows version, but for the Mac
A free program that reduces high-iso noise.
Photography Related Websites
One of the best online resources when it comes to digital photography
A great place to learn more about off-camera lighting
Contains the best online photography forum out there. Also has a ton of great gear reviews as well as helpful articles
The best online resource when it comes to landscape photography. Has an exhaustive list of tutorials and articles as well.