I believe a new record - over $1M USD turnover in 24 hours at MtGox:
http://omnicompass.com/mtgox/?Min=8&Max=35&Inc=1Tue Jun 7 00:20:42 2011 (GMT)
Recent USD Exchanged
TimeBin BTC USD
Mon Jun 6 00:00:00 2011 348 $6,403
Mon Jun 6 02:00:00 2011 6,514 $119,861
Mon Jun 6 04:00:00 2011 8,428 $155,079
Mon Jun 6 06:00:00 2011 3,274 $60,243
Mon Jun 6 08:00:00 2011 1,857 $34,170
Mon Jun 6 10:00:00 2011 8,497 $156,349
Mon Jun 6 12:00:00 2011 8,680 $159,716
Mon Jun 6 14:00:00 2011 2,361 $43,444
Mon Jun 6 16:00:00 2011 5,727 $105,380
Mon Jun 6 18:00:00 2011 1,866 $34,335
Mon Jun 6 20:00:00 2011 6,232 $114,672
Mon Jun 6 22:00:00 2011 938 $17,260
Tue Jun 7 00:00:00 2011 132 $2,429
TOTAL: 54,854
$1,009,341