Luke Welling of Hitwise showed up some trends using the Hitwise database. It is mostly site visits. Interesting to compare this with Google Trends and Tiobe.
Mailing lists seem to be getting replaced by feeds.
Ubuntu matching Debian in May 06. Redhat is still getting more visits than all of the others combined.
PostGres is gaining on MySQL and Oracle is in slow decline.
PHP continues its dominance over Perl and other dynamic languages.
Digg.com eclipsed slashdot.org in 2005.
Wikipedia is huge.
DEL.ICIO.US went crazy last year.
feedster.com dropped off after site difficulties and is now coming up.