Images

• Where to find images for your website
• HTML code to position images in your pages/posts
• Free image editing for Mac users

You can also use free image editing via your web browser that allow you to crop, scale, adjust colors/contrast/exposure, rotate and more. Check out:

• Picnik.com
• Photoshop.com

Good tutorial about how to prepare an image for use on a website:

• Preparing An Image For Web Vs Print