According to Nasdaq.com historical data the most action seen in last 10 years was from 30-Jul,2003 to 08-Aug,2003;
Date Open Close/Last Volume
07/30/2003 2.700027 2.520025 45,607
07/31/2003 3.090031 6.750068 6,309,170
8/01/2003 8.130081 10.95011 21,267,224
8/04/2003 11.400114 13.260133 15,287,584
8/05/2003 13.935139 13.590136 13,437,956
8/06/2003 12.180122 9.420094 11,136,889
8/07/2003 8.550086 10.170102 6,858,868
Other dates with signifcant volume:
04/13/2004 - 4.8 million
12/14/2004 - 6.7 million
03/01/2010 marks the most volume traded in over 5 years.
Pre-split or post split doesn't matter. A dollar is a dollar right?