There's no way I can post it in full here without everyone having stupidly wide monitors. Click above pic to visit my dA where the full version can be downloaded (4910x768, 1MB)
I made use of the sunlight while it was here today. Set the 50D to high speed continuous, stuck the 100-400L on the front fully extended and started my arm workout.
Settings for this was Tv mode at 1/800s and -2/3EV as the Gulls tend to white out against the background. Lens on IS mode 2 although I'm not sure if that was needed at all given the shutter speed. If I could do it again, I would go to -1 EV and knock the shutter down to 1/1000 as I still lost some highlights and I think that's motion blur on the wingtips.
Initial stitch done by Photoshop Elements with tidy up in Paint Shop Pro 7.