I had to search for (stock) images today, to include in a presentation. I found myself tabbing through different search engines all the time, so I decided to write an amf/swx service which has methods to search SXC, MorgueFile, Google Image search and Flickr. This way, I can write a flash frontend, which makes my life a little easier.
You can see a simple image browser at: http://labs.aboutme.be/image_search/.
And of course, the server side code is available for download aswell.. You can find the service itself in swx/services/ImageService.php. For Flickr, you will need to have an API key, and enter your API key in the ImageService PHP file.