It has been noted that Slate doesn't have the greatest art coverage, most recently here.
I would like to see Slate feature or link to a different city's artblog every week. There are so many they could do this for six months easily. A few that come to mind -
Richmond - that's me!
All of the artblogs would get tons of new readers and Slate would have art coverage every day - it's win-win!
Artnet or Artforum.com might want to consider this also.