@DavidWRobinson - well I hope that it's definitely more 'block' than 'bust'. I'm just toying with the idea of publishing direction myself at the moment. There's a very interesting discussion been rumbling on in the Pub for a while now, lots of gents called David in there for some reason, so I suggest you join in, being eminently qualified in name.
Good luck with the upload. I'm thinking smashwords is a good place to start myself at the moment, although I'd quite like to have my ISBN in place before I go Kindle. Cheers, Gav