I read two dailies from Big Head Press. Escape from Terra, and Quantum Vibe.
Both are pretty much just L Neil Smith space-opera set in a settled solar system, full of Libertarian preachiness.
There's several others, but I won't admit to them. Some decidedly NSFW, and some of you folks think I'm weird and pervy enough as-is.
My biggest beef with webcomics is finding a good one. Going back through a couple years archives in an afternoon, being invested in the story line, and because it's so painstakingly drawn, and the author/artist needs his day job to make ends meet, updates are insanely infrequent. Once a month or less. You stop clicking the links every day, subscribe to the RSS feeds, but you find yourself checking even that...
The crappily drawn ones, but that have good writing, that the producers are able to update on a regular basis tend to be more satisfying. But you keep on checking the slow ones.