Mainly because Google is the hardest search engine for me to manipulate So i figure it is the most relevant. Also, as others have mentioned, they keep a clean homepage that loads fast with no popping flash ads *cough* yahoo *cough* and even have a cute logo on holidays.

I always use google because it gives more perfect results.

Well when i have to search some thing on NET i just type google+ ctrl + ENTER Because i knew that what ever i want to search google Give me ...So why not google ? i like yahoo's other services but not Yahoo Search engine because its bit Slow and heavy ...And For msn I just like to use MSN Messanger nothing else . So Why not google for Searching some thing ?

another reasons that I used google, it has a a lot of services you can choose on, it only depends on what suits to your needs!

because google homepage don't have a lot of crap on their homepage, and oh yeah did i mention they give the most accurate results than any other search engine.

not only they give accurate result but also they are widely use by all people in the world.