PhotoXpress, featured on TechCrunch earlier today, is a new source of free royalty-free stock images. In order to download the images without watermarks you must register for a free account with PhotoXpress. Once you have registered and completed your profile you can download up to ten images per day. The PhotoXpress collection currently contains nearly 350,000 images with many more being added daily.

Applications for Education
PhotoXpress is a good resource to add to your list of places for students to find free images for their digital presentations.

Here are some related resources that may be of interest to you:
Photos 8 – Thousands of Public Domain Images
William Vann’s EduPic Graphical Resources
Morgue File – Odd Name, Good Free Photos