I didn't get a chance to go to OSCON 2008. Bummer. But I can live vicariously through google. So, along with all of the announcements you've heard from OSCON, I know present the OSCON 2008 - Google popularity contest. This is a completely unscientific survey of google hits. I was searching blogs and news. I started with just news but the blogs hits really upped the numbers.
To run these searches, I use "oscon 2008" and the search term, for example:
"oscon 2008" mysql
In the case of open source, I also quoted "open source".
I'm using google's about number. I didn't sit and count each hit. ;-)