This sounds awesome: Photo Dropper is a Wordpress plugin to find and add Creative Commons licensed photos to your blog from Flickr.
I haven't tried it yet but I'll update this post once I do.
Read more about Photo Dropper on ReadWriteWeb.
Update: Had a chance to install and test the plugin. It's cool, especially for a Version 1.0 but a few shortcomings are immediately visible. For one thing, once you've added a photo, you have to edit it via the HTML. It would be cool if you could change the settings (size, etc.) after adding it. Also, it would be really great if you could resize the photo or crop it (these are pretty hefty feature requests that might hopefully make it into future versions). An easier feature request to implement would be to see what the various sizes are (S, M, L) in pixels and to be able to specify alignment/float values.
The Find and add Creative Commons Licensed photos to your blog from Flickr article by Aral Balkan, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial 2.0 UK: England License.

Be careful with the Creative Commons license. Last week I received an email where a guy changed the licence type at flickr and want me to remove the picture. Best is to ask the owner of the pictues direct by email to get an approval.
Hi Thorsten,
The whole idea behind Creative Commons is that you _don’t_ have to ask. The license tells you what you can do. If someone changes the license afterwards, it does not retroactively apply to your right to use it in the past. In other words, you do not have to remove the picture if it was licensed to use under a Creative Commons license in the past if the licensee changes the license in the future.
I think, this is true only for stuff declared as public domain. Once it is marked as public domain, you cannot restrict the license anymore. However, if it had an attribution license for example, you can change it to “all rights reserved” and require people to stop using it.
I find it a very beautiful Plug-In. But unfortunately I had also already problems with people because of the license
Creative Commons Licenses will be a great problem in the future. Be aware, guys. Afterwards changes can cost much mony, espacially in some european countrys.