Connecticut- 179,056 in 2000, 114,264 in 2004 (90% reporting)
Georgia- 284,431 in 2000, 472,857 in 2004 (80+% reporting)
Maryland- 507,462 in 2000, 230,048 in 2004 (54% reporting)
New York- 921,465 in 2000 (92% reporting), 532,881 in 2004 (78% reporting)
Ohio- 860,568 in 2000 (92% reporting), 773,762 in 2004 (66% reporting)
Rhode Island- 46,844 in 2000, 32,699 (98% reporting)
Vermont- 49,283 in 2000, 59,681 (78% reporting)
(2000 numbers from Dave Leip's US Elections Atlas)
So we've got turnout down everywhere except for Georgia (flag vote), probably Ohio, and the Howard Dean Memorial in Vermont. Should we be worried?