Twitter is using an octothorpetag #votereport to mark voting reports today. There's several systems downstream processing and mapping that data. See e.g. votereport.us (simple log), twittervotereport.com (map), and the Twitter vote report wiki (details for media and developers).
You can also get a pretty good point of view via Twitter just searching for the string Ann Arbor.
Here's reports as I've seen them so far this morning, times approx:
730am @mollyali: Couple hundred people in line @ pioneer high, ann arbor.
700am @CharismaArts: lines already out the door at pcnt 3-4 and 3-7 in ann arbor
700am @twbrandt: Arrived at my polling place (Ann Arbor Twp hall) promptly at 7. Longest line I have ever seen
700am @jakewalker: Hundreds of students in line in ann arbor at 7am to #vote. Hundreds.
Throughout the day, the Ann Arbor Chronicle is reporting from the city's polling places.
The Ann Arbor News has a story about morning voting lines and waits, with the all-too-predictable snoozesque comment blather.