Well cause of all the fuss I've actually downloaded a copy

(as I said elsewhere I've always really liked the look of it) but if I actually used it I'd buy a license if it's kept going.
I cant help you much except with uneducated suggestions:
As Chris points out the download traffic will be affected by the change to commercial - well, as long as you charge for personal licenses. That will make it much easier to cope.
I would suggest for non-business use, a reasonable to a low price - sorry I've no idea what the competition costs, but make it cheaper

And a more expensive but not outrageous price for business (just cause we're in business doesnt mean we're making lots of dosh!)
How about this basic license model:
Personal: for one person only - but on a reasonable number of machines (I know there was someone talking on the other thread about having multiple copies on one machine...)
Business: for one machine only (or a limited number) for any number of users
I came across that model lately with roughly the same price for both - seemed fair to me.
I find one machine only for a personal license just, eh, not really nice
