It was jail broken about 18 months ago when you were limited as to which software version could be jail broken- unfortunately my 18month old got her grubby fingers on it, managed to turn the wifi on (!) and it updated the software to 5.7.something
Having read the big post above this one, it sounds like there is no limit on software version so I'd probably just redo the whole process.
Trouble is, I don't want to lose which of many books in my collection that I've read!
Some things in life etc etc
