The other day I was looking for websites that let you easily edit photos online, and after a couple of hours of shlepping around I came across Picnik, finally - what a great find!
I love sites that are easy to use, and Picnik lets you upload photos and EASILY make all kinds of graphic and text effects. Compared to the other sites I found they were light years ahead - the results were professional looking, and you can do all kinds of complicated things, such as stretching parts of the image, etc (not useful for home photos, I know, but nice if you're creating graphics for your website) and the interface is so intuitive that I think even the most non-techy agent would not have a problem doing some pretty cool stuff.
There's a free level that offers a ton of options, and also a paid level for a mere $24.95 a year. I highly recommend you go and check Picnik out, it is a joy to use. Have fun!