I found three of my serials listed on Comic Rocket, which is... a crazy-elegant interface for keeping up on web comics. They get loaded into the system and then you can page through them and "mark your place" on where you stop. Once you've added that comic to your list, it will separate your comics into comics you've caught up on and those with new pages to read, something it seems to learn by magic (okay, by constant web crawling, but it looks like magic).
It seems a pretty great way to keep track of your serial reading too. I didn't add any of mine to the database--someone else had! So I guess they're fine with adding serials to it.
Anyway else use it?