xkcd was certainly an influence, although there are really more differences than similarities. "Boxjam's Doodle" probably moreso.
"Minimalism Sucks" may exert some influence now that I've started reading it
As might "Modern Love", I like it
I've been averaging slightly over one a day for over a month now... it's a surprising amount of work keeping the ideas flowing. I'm really hoping I won't suddenly dry up...