Oh No Robot
Oh No Robot is a webcomic search engine created by Ryan North and T Campbell that went live in November, 2005. It enables users to search the full text of participating webcomics archives by storing a full transcript of each comic installment.
Alternatively, webcomic creators can use an API to add the transcripts themselves.
Additionally, creators can use Oh No Robot to generate archive pages and RSS feeds for their webcomics.
Oh No Robot has recently added a Random Comics browser, which lets you jump from random comic from to random comic out of the Oh No Robot database.