There seem to be a lot of Saturnian moons that are not round. They are too small. Jupiter has some irregular moons too.
Check out the raw images off the main page, it lets you choose which object to view pics of.
http://saturn.jpl.nasa.gov/multimedia/images/raw/index.cfm
There seemed to be some bugs in this site a while back. I don't know if they've got them fixed yet. They should have by now.
I think Januus, Calypso, Helene, Methone Pallene, Pan, Pandora and several others are irregular.
The Cassini site is VERY cool. I visit it almost everyday to see what's going on. The recent close flybys of Hyperion and Tethys produced some really cool pics. ![Cool [8D]](/ASY/CS/emoticons/icon_smile_cool.gif)
I also visit the Mars Rover site almost daily:
http://marsrovers.jpl.nasa.gov/home/index.html