You'd think with all the people here who like MSPA we'd have this thread sooner.
Anyway, I'm on Act 5 of Homestuck now. It's very good, but it takes forever to pick up.
I haven't read any of the other adventures yet, luckily you don't have to have read earlier stuff to understand the newer things, though there are in jokes at times.
I'm actually already missing the [s] comics (Act 5 hasn't had an [s] comic yet), it'll suck when I'm reading the older adventures which don't have any [s] comics at all.