“Between Failures is a slice-of-life webcomic following the (somewhat under-motivated and decidedly sarcastic) staff of a chain bookstore. The primary protagonist is Thomas Blackwell, but it cuts to follow many members of the staff. It’s often compared to clerks, though up to the second volume only 2 customers have actually been shown.” (It’s actually a lot more like Empire Records, which the author totally suggests you see.) “The main focus are the characters and the shenanigans they come up with to keep themselves entertained.”
It updates Mondays, Wednesdays, & Fridays at present, but the author often says witty things on Twitter, and posts extra stuff in the blog from time to time. He is very cool.