Dunno what's going on here - I've tried to set up the Flickr widget, and when I insert the Flickr ID bit (12421653@N00/), I get someone else's photos.
Reminds me of that time Mrs Robinson's photos accidentally got delivered to our house when I was 12. Boy, I sure grew up fast that summer!
. . . uh, Working on the assumption that I've filled out the widget form wrong - what did I do?