I created a custom search engine combining blog rolls of people I follow as Knowledge Space Search on Google.
Testing time for the engine…I have google versus my search engine well which is also on Google, but only I understand my context better than how google understands my search term. Here it is, I tried with the popular term in KM circles, Safe Fail comparison below
You can see that Google does not distinguish between Fail Safe and Safe Fail due to I guess proximity of terms, and the first real distinction is coming in the 7 the item of result set.
Compare that with what you get in my custom search engine Knowledge Space Search
I think the underlying blogs/sites will need to be kept updated on a regular basis with newer and fresher resources, which I think is not a huge effort considering the fact that my google reader feeds is still under 100.