I voted at the local middle school in the semi-rural (for the DC area, anyway) town I live in at about 10:30 this morning. Normally, there is no wait whatsoever. This morning there was about a half-hour wait. I think part has to do with the number of ballot measures on the Maryland and Montgomery County ballot from police union issues to gerrymandering to alcohol by the drink in my dry town (the only such town in MD) to gay marriage to booting politicians for legal transgressions to gambling.
No low turnout here, though MD is far from a swing state. Obama will win by 25%.
In keeping with my pledge to not vote for either Obama or Romney so I could ultimately support the winner, I voted for Gary Johnson.