I’m testing a rather nifty flickr plug-in called Flickr Insert [1] from Stuffed Guys. It works by translating a special flickr tag into static links to flickr pictures in the post, and it also maintains a cache of thumbnails on your local server.
Below is an example of my flickr images that were tagged with “wpphilaetempleegypt” at the time of posting.
[2] 
[3]
The plug-in could use some improvements. It would for instance be nice if you could specify some alignment tags, like left, right, top.
But it is all-in-all the cleverest application of the flickr API I’ve seen. I just whished that ourmedia.org had a similar API, since they have no limits on storage and bandwidth. I’ve heard in a Podcast from ITConversations, that ourmedia.org is planning to introduce an API.
Another thing, it should be relatively simple to implement a flickr compatible API that could increase the usability of general image gallery software like Coppermine. I know that an API is in the works for Coppermine, but it looks like the project is on hold. They have also opted for an API that isn’t flickr compatible. I believe that they need help.
There is however another tool for Coppermine, CpmFetch [4], that looks promissing. I expect to begin testing it soon, since I’ve invested a lot of time building my Coppermine gallery content.