Got OpenDNS? search is redirected to pesky Yahoo? Want your Google back?

In Firefox go to About:config and change key keyword.url to

For IE it is a bit more complex:
In registry find HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\SearchScopes

If Windows Live Search is your default search engine in Internet Explorer 7, open {0633EE93-D776-472f-A0FF-E1416B8B2E3A} and set the value of URL as{searchTerms}

In case of Google, open the corresponding key and set the value of URL as{searchTerms}

Technicals: I think OpenDNS redirects Google Searches to OpenDNS Guide if the “source” parameter is present in the search URL. Remove that from the address and OpenDNS would stop redirecting Google searches.