I'm posting this because it may be of interest and I'm a nerd for these things. There are more than 300 Crosstalk authors and though I don't think we've had anything mainpaged in a while, Quantcast shows us pretty steady with 1000 to 1500 uniques, per day.
Of course most of the other communities have more, but their numbers include more mainpaged posts (some even daily) and they have dropdown support.
We've built this community ourselves.
In case anyone wants to play with additional stats: you can get numbers and demographics for the other communities by changing the Quantcast URL; You can get a ranking of all dotKinjas here and if you'd like to find your own ranking compared to all other Kinja bloggers, you can play with the order of this list.