Most folks here are familar with Comixpedia and the Webcomics Examiner but may have overlooked other sites that talk about the broad spectrum of webcomics. Their approaches vary, but are all worth checking out: Time Waster’s Guide, Korsil and Kill Boredom.
Kill Boredom, like the Webcomic List has a script that counts how many times readers click through comics on a list (a variation on the traditional Top List scripts). I’ve never sure what the value of something like that is as I doubt most folks actually conduct their regular reading of webcomics through a portal site. I’m not opposed to lists per se, but I think it’d only be worth the hassle if it was generated from a more useful or valuable set of information than the approaches I’ve seen to date.