As part of their "Off to College With Syndication" sales pitch the Syndicated Network Television Association has lots of numbers to show off.
One interesting slide in the report shows the relatively high ratings among adults 18-24 (not a typical age range we report, but this pitch was tailored towards reaching college students) that syndicated programming gets in the summer vs. an assortment of cable and network competition. Some of the numbers are likely surprising to many folks.
Click the picture for a full sized image. Note that these numbers are from last summer (2008), but that's what you've got to go with to sell advertising for this summer.
If you're so inclined, download the entire report here.