(I also have a free watermark photoshop action)
Are you afraid of your photos getting stolen online? Are you worried that your customers will take the low res photos you put online and try to print them? One easy way to avoid this is to watermark them.
To do this you will take your photo, re-size and sharpen for web (you may use the Crystal Clear Web Sharpening Photoshop actions) that is part of the FREE MCP Actions High Definition Sharpening set. Then you need to create a brush to stamp on your photos, using either your logo or text. This video tutorial will teach you how to make a watermark brush to use for branding your photos in Photoshop.