I made a couple of charts (sheets 1 and 2) comparing weekly print and online figures for a handful of large papers.
You can also see similar graphs here.
According to figures from Scarborough and the Audit Bureau of Circulations released this week:
The Atlanta Journal-Constitution beats the other papers in the group, with its Web numbers representing 37 percent of its print figures. The AJC is followed closely by the Arizona Republic, at 35 percent.
I did not include the largest papers, such as the NYT and WSJ.