A couple of weeks ago I made a plugin to search Stack Overflow. I thought why limit yourself with this.. so I made a more generic version of the plugin called "Search Anywhere" on Will Bond's Package control. It's also available through github here: github.com/ericmartel/Sublime-T ... ere-Plugin
Basically, you can choose a default search engine. You can perform searches with the current selection or from input. You can also specify a default search engine per file type, so for example your searches on your .php files could be on PHP.net while everything else on Google.
Hope this is helpful