Google Co-Op, a recently announced service, allows you to create custom search engines. Here is a custom search engine for Symbian related sites, which can also be accessed via SymbianSearch.com. The search includes many of the largest Symbian sites, but if you think you know of another site that should be included you can edit the list of included websites. 

Current sites include:

symbian.com
developer.symbian.com
www.s60.com
www.uiq.com
developer.uiq.com
developer.sonyericsson.com
www.nseries.com
www.newlc.com
www.e-series.org
www.my-symbian.com
www.symbianone.com
www.allaboutsymbian.com 

and more... 

The engine should give good result when looking for Symbian, S60 or UIQ related results since it combines the power of Google Search with the benefit of hand picked, 'wisdom of the crowds', websites. For example you can use this search engine to search multiple Symbian forums at one time looking for a solution to a problem.