Getty Images

One of the biggest and most well known online retailers of images.

Price: High
Quality: High
Usability: High

Corbis

High quality images and templates. One of the original stock imagery companies online.

Price: Med
Quality: High
Usability: High

Foto Search

Over 900,000 images including photos, clip art, illustrations, maps and more. Also sells compilations on CD.

Price: High
Quality: High
Usability: High

PhotoSphere

A great online resource of royalty-free stock photo images.

Price: Med
Quality: Med
Usability: Med

Microsoft Design Gallery Live

Great for web use, completely free, integrates nicely with Microsoft Office.

Price: Free
Quality: Low
Usability: Hig