Found this interesting website which has a few drawings detailing the various features that appear on images of Jupiter, or when eyeballing Jupiter through the eyepiece.
It's got some nice descriptions of them afterwards, too.
Thanks Mike, I reckon it adds a lot of interest when you can name particular bits... personalises it and you know when you and someone else are looking at the same bits.
Hmmm... bit out of date though, they don't have the NAGAGRSS here