After updating to 10.7.3 I am no longer able to connect to the internet.

Updated to 10.7.3 this morning on my Macbook Air (Oct. 2010 model). After restarting, I am no longer able to connect to the internet. I can connect to the router, and pull a valid IP address (sometimes - other times I get an automatic private IP), but I am unable to get to any websites, check email, etc. I am able to ping websites AND visit websites using their IP addresses, but not using their DNS names.
I called Applecare this morning, and the tech walked me through some troubleshooting steps, including:
Rebooting into Repair partition to check connectivity there (same issues, no change)
Deleting and recreating various config files (Networkinterfaces.plist, preferences.plist and com.apple.airport.preferences.plist) (no change)
I've also tried reinstalling the update (both delta and combo), repairing disk permissions and rebooting into safe mode, nether of which has solved the issue.
Also on the network are (Mini, not updated to 10.7.3), a PC, my iPhone and an Apple TV, all of which aren't experiencing any issues. Any ideas?
Thanks.

Here is something to try. Boot into the Recovery HD by holding
down Command+R when booting. Select the get help online option.
It initially opens Safari with a local web page, but you can use
the bookmarks on the bookmark bar or even enter a website.
Many extensions may not be available but it could tell you if
it is your Lion install that is a problem or perhaps a hardware
problem.
If you can browse around in this mode, then it could eliminate
any possible hardware issues. If you still have problems, then
the issue could possibly be hardware/driver related.
Give it a shot and see what happens.

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