As with many, Yosemite has killed my internet connection.

So, I tried upgrading to Yosemite the day of, and like many others here, my internet connection (wifi and ethernet) has yet to work.  I've tried a few different "tricks" but I haven't had any success.  I've even tried downgrading back to Mavericks, but most of the installed programs are non-existent.  Any suggestions?
2010 iMac 3.06 GHz Intel Core I3
ATI Radeon HD 4670 256MB

I have the same issue. As many I tried doing this:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
Which will fix the internet connection till your next reboot or till you logoff. As soon as you login again or restart your Mac you will encounter the same problem again though. The underlying cause seems to not be with the internet or wifi connection though but with the way Mac OS X Yosemite resolves DNS. If you browse the web by using just IP addresses it'll work just fine.
Before Yosemite DNS was handled by mDSNResponder which eventually got replaced with discoveryd.
When I went to check my /System/Library/LaunchDaemons folder though I found that discoveryd.plist, discovery_helper.plist were sitting right next to mDSNResponder.plist and mDNSResponder_helper.plist.
My log files also showed a lot of entries saying: connect() failed path:/var/run/mDNSResponder
Maybe the actual mDNSResponder was correctly removed during the update process but the plist files in the LaunchDaemons folder remained causing our current problems ... I'm not sure.
What I did was I removed mDNSResponder.plist and mDNSResponder_helper.plist from my /System/Library/LaunchDemons folder and so far my internet connection seems to be working fine even after I restart my Mac or logoff and login again.

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