Poll Results

Total votes: 541

Daily: 442 (81.7%)
Few times a week: 54 (10.0%)
Weekdays: 32 (5.9%)
Weekly: 8 (1.5%)
Less often: 5 (0.9%)

Since this poll ran for about half a week, there's an obvious selection effect in that people who check the site weekly or less often might not even have had the chance to vote. So I figure the last two categories are actually a bit more common than this poll indicates.