A short list of them.

construction

• Institute for Social Research construction webcam, http://constructioncam.isr.umich.edu/view/viewer_index.shtml?id=4161

campus

• Shapiro Library: looking out on The Diag, http://shapiro.cam.lib.umich.edu/

town

• Seventh and Washington pedestrian island - a2cam from Wayne Eaker, Samutech
• Ann Arbor Bed and Breakfast - angrybird's Webcam via Weather Underground
• Alley and sky behind Barracuda Networks

schools

weather

no longer online

• Library Lot construction: live webcam, requires Silverlight; construction has finished
• North Quad construction: live webcam, mjpg - construction has finished
• Law School construction: live webcam, mjpg, snapshot and project overview
• The line at Rick's American Cafe, looking out over Church Street: http://ricksline.com/ (now gone)
• I Opt: looking out on North University,
• State Theater - annarborcam
• Go Like The Wind Montessori School http://www.instacam.com/showcam.asp?id=ANNRB&size=S
• Weatherbug: Detroit Edison, Ann Arbor