If you haven’t checked out the Dad Labs website yet you are missing out. This high quality web-based blog/tv show is professionally produced and has some really funny topics (search the Circumcision Decision video).
I also really like the reviews they do of popular baby equipment. This one focused on BRITAX car seats and explains in a bit more detail what True Side Impact Protection really means: http://www.dadlabs.com/Shows/car-seat-test-drive-britax.html
We carry the BRITAX Marathon and Roundabout car seats as part of our Baby Equipment Rentals. I recorded a video showing the features of the seats we carry at One Tiny Suitcase: http://onetinysuitcase.wordpress.com/2009/01/24/britax-marathon-car-seat-rentals/
If you are looking for a high quality, easy to use, easy to clean car seat- this one is my favorite!