Upgraded from 10.6 to 10.6.2, network stopped working on an iMac.

Went to the Apple store yesterday, bought Snow Leopard. Installed it, everything seemed to work fine at 10.6.0. Did Software Update, it said there was a 10.6.2 update (guess it combined 10.6.1 and 10.6.2 into one?), so I downloaded it, it installed and rebooted. Ever since then, I can not get networking to work, using either cabled gigabit ethernet, or wireless to a Time Capsule wireless access point.
Trying rebooting several times, disabling/re-enabling networking, no help. It sees the router, gets a local ip address, can ping the router, but can't get to the outside world.
This is an older iMac, 24", "white plastic soapdish" model, before the newer models came out. I'm hoping someone can provide some other hints.

You mentioned having a network problem. Regardless, being able to get to the outside world is a common problem under Sno. Adding a new location has worked for some.
Go System Preferences > Network > Location.
Edit location (whatever name you want).
Click + and then click done.
Try your browser.
And, here is another possibility that has worked for others.
Go Finder > Your HD > Library > Preferences > SystemConfiguration.
Move the SystemConfiguration folder to your Desktop.
Restart.
Try your browser.
Try something a little different.
Go Finder > Your HD > Library > Preferences > SystemConfiguration.
Move the SystemConfiguration folder to your Desktop.
Go System Preferences > Network > Delete all locations, and use Automatic.
Restart.
Try your browser.
You may have to reconnect to your wireless network if applicable. And, you may need to go System Preferences > Sharing and re-enter your computer's name. Check what name is given in sharing before following my instructions. If problems develop, then your can move the original folder back where it started—overwriting any folder recreated.
Finally, try deleting any KeyChain entries related to the apps, etc., you mention.

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