Here's some info from wagerline regarding the number of people on a side. It's just for their non-wagering site but could still be helpful.
All Player Consensus|
10/25/2006
<TABLE id=tblData cellSpacing=0 cellPadding=0 border=0><TBODY><TR><TD>
Sides (ATS)
<TABLE class=data id=tblConATS cellSpacing=0 cellPadding=0><TBODY><TR class=datahead><TD width="11%">Time (ET)</TD><TD width="20%">Away</TD><TD width="6%">Line</TD><TD width="6%">Picks</TD><TD width="8%">Pct</TD><TD width="22%">Home</TD><TD width="6%">Line</TD><TD width="7%">Picks</TD><TD width="8%">Pct</TD><TD width="6%">View</TD></TR><TR><TD class=datacell>8:00 PM</TD><TD class=datacell>
Detroit</TD><TD class=datacell>
-101</TD><TD class=datacell>551</TD><TD class=datacell>57.88%</TD><TD class=datacell>
St. Louis</TD><TD class=datacell>
-107</TD><TD class=datacell>401</TD><TD class=datacell>42.12%</TD><TD class=datacell>
Detail</TD></TR></TBODY></TABLE>
Totals (Over/Under)
<TABLE class=data id=tblConOU cellSpacing=0 cellPadding=0><TBODY><TR class=datahead><TD width="11%">Time (ET)</TD><TD width="22%">Away</TD><TD width="8%">Total</TD><TD width="24%">Home</TD><TD width="6%">Over</TD><TD width="8%">Pct</TD><TD width="7%">Under</TD><TD width="8%">Pct</TD><TD width="6%">View</TD></TR><TR><TD class=datacell>8:00 PM</TD><TD class=datacell>
Detroit</TD><TD class=datacell>
7.5</TD><TD class=datacell>
St. Louis</TD><TD class=datacell>517</TD><TD class=datapicks>64.63%</TD><TD class=datacell>283</TD><TD class=datacell>35.38%</TD><TD class=datacell>
Detai</TD></TR></TBODY></TABLE>
</TD></TR></TBODY></TABLE>