The Prime Of Ambition - a very well drawn fantasy comic. Still fairly close to the start, but seems interesting.
Between Two Worlds - very intriguing story about a group of young friends who find their way into another world. This one is quite a slow builder, but rather charming and with a strong emphasis on characterisation.
Girl Genius. A fun romp through a world of mad scientists, ruled by those who are 'Sparks' - ie have true scientific genius. Agatha Clay, our heroine, seems like a bit of a scientific klutz - but there's more to it than that... Silva - I think you will love this one
Undertow. Fantasy, and really just starting out, but with good art and definite promise.
Legendary. Art is very basic, but it's a great piss take on Final Fantasy and console RPGs generally.
Dragon In The Courtyard. Fantasy series with really good computer art. Sometimes contains adult themes and not suitable for all ages.
Dire Destiny. Semi-mythic celtic-style fantasy. The gods seem to have abandoned the land, yet one man still believes - and is a hunted outlaw because of it. Quite dark in places and not suitable for younger readers.
Worldbreak. One of the best drawn series I've ever seen, on or off the web, Fantasy, and just getting started. Currently down due to bandwidth overload.
Succubus Justice. Surprisingly, this tale of Succubus finishing school doesn't involve sex, does involve a lot of comedy, and is definitely PG. The art won't blow you away, but you'll be too busy laughing to care.
Tales Of The Travelling Gnome. A well written and superbly drawn fantasy comic that is neither as pretentious nor as twee as the name might suggest. Slow to update and still really starting out, but very good for all that.
A little late response, but I love Girl Genius. I'm just more likely to buy the trades than keep up with the web comic. I keep telling myself that one of these days, I'll just buy the first trade. Hasn't happened yet...
A friend just told me about a pretty cool on called Looking For Group. I haven't had time to check it out, but it looks cool. I think it's based on World of Warcraft. www.lfgcomic.com/