it turned out to be my USB stick in the end.
I found another 1gig stick and it booted fine from it.
So far tried crunchbang, easy peasy and I've now formatted again and I've just installed Ubuntu 9 UNR which so far seems to be the best for the bunch IMO.
Any reason why? I'm thinking of getting a netbook and have noticed all of those but not had the chance to try them out, would appreciate your thoughts.