I popped my Internet Cherry on Demon
In fact I still remember the IP address for fuchal.demon.co.uk - 184.108.40.206
It was one of the few ISPs in 1994-ish that would let me connect an Amiga and whilst they didn't officially offer help, the demon.ip.support.amiga group was massively useful. Started out on their own supplied AmigaNOS with it's textual goodness and then blew my mind with AmiTCP which offered craziness such as graphical web browsing.
Also remember that I ended up on a test for their Ascend modems, because I'd splashed an obscene amount of cash on a Sportster v34 modem before realising that most ISPs only offered v32bis.
Good times. Thanks Cliff.