Those of you who use Flickr and do a lot of blogging or post to online forums might want to consider the
Flock Browser. Flock is based on Firefox, so it has tabbed browsing, extensions, and all the other good things you've come to expect from that platform.
You can subscribe to your photostream, which will appear as thumbnails across the top of your browser window. From there, you can just drag and drop your images into your posts. You can choose small or medium sizes, and it will create a direct link back to the Flickr page for your photo. The screenshot below shows how it's done, using my blog interface...
For the record, I have no vested interest in Flock, apart from the fact that I have found it to be a very useful tool.