OK, the last count that was 'heard' was 1152 and registration closed yesterday. I expect the final count to be around 1200, which is comparable to the last few years. On average, about 60-65% of that number advances to Bid Day.
here's the online version of this year's Tomahawk:
http://greeklife.fsu.edu/Documents/FSUTomahawk2009.swf