The order isn't by popularity, it's just the order I remember to visit them in. It's related to the order I discoverd them in, but isn't a 1:1 match. I've been known to start the day out with Schlock Mercenary or Something Positive just because I'm in a hurry and want to skip to the good stuff. :)
Of the intermittent ones, some I've never visited regularly (partially clips, penny arcade,the devil's panties... there are a couple dozen of these I have listed in a text file), some stopped updating regularly (like Green Avenger, Crap I Drew on my Lunch Break, GPF...). A few I used to follow regularly but stopped visiting entirely (clan of the cats, alice comics, scary go-round) because they just lost my interest.
I miss some that stopped (like Casey and Andy, although Cheshire Crossing is great, but 3 months between issues).
At Penguicon 4.0 I got introduced to Home on the Strange, and although I still catch up to it intermittently rather than following it regularly, this one is just beautiful. The "intermittent" ones like that become part of my daily trawl when they can keep me coming back regularly for a couple weeks. Then it becomes habit.