Love and Capes is still updating on line - I think the printed version has finished, but it looks like there's still a fair way to go with the online version.
A couple I like
Freefall web comic -
http://freefall.purrsia.comFairly hard future SF with an intelligent bioengineered wolf as the main character - updated three times a week since 1998. Mostly played for laughs but there's an interesting story arc about the rights of sentient AIs (including the main character). A bit slow-moving, I think we're still only a couple of WEEKS into the story after 17 years!
Girl Genius -
http://www.girlgeniusonline.comWeird science in an alternate world that was shaped by "mad boys" (mad scientists) and "Sparks" (genius-level mad scientists who seem to be able to alter reality to make their gadgets work) with mechanical robots (clanks), death rays, etc.. Lots of episodes, gorgeous art and updated three times a week.
Second Empire -
http://www.mechmaster.co.uk/cg-lair/daleks/secemp-index.htmThis is just awesome - a lovely CGI-illustrated web comic running to 700+ instalments but now complete, the history of the first Dalek civil war - with lots of wonderful weapons, weird technology, and more than a few references to Star Wars and other fun stuff. Keep your eyes open for things going on in the background. What it doesn't contain is The Doctor, although there are hints that he might have once existed, or has erased knowledge of himself from their records - but the Daleks consider them to be the equivalent of silly season stories! It's an amazing story and I thoroughly recommend it.
