Thanks Mark. The phone works fine so I don't see that you 'screwed up' (especially given the quantity of morphine you were dosed up on at the time)
I still haven't found any spare time to look into alternative ROMs but I would like to know what I need to do to when I di find time
You need a program called Odin, and an insecure kernel......and that's it.
I have a suitable kernel here that includes ClockWorkMod recovery and SuperUser so you can make a complete "ghost" image of the handset in case you kill it along the way, I'll put a quick "how to" together along with the required files in the next couple of days for you bud
As far as custom ROM's go, I tend to stick to Samsung based ROM's and I'd recommend OmegaROM as a good starting point as you dictate what the default system apps will be (eg, Facebook, etc) rather than your service provider (in other words, no useless bloatware taking up space).
You can also repartition the internal SD card to regain up to 3GB of internal storage dependant on system configuration, but we're probably better off saving that one for another day.