Where can I find the best deal for a mortgage? And how reliable are places like LendingTree? [More inside]

I'm looking to buy a house and the local banks here aren't offering me the best rates. My credit score is like 790, yet they want to give me %4.75 for a 30 year. Which right now is high I think.

So what is the best way to get some competing bids? Have you guys used places like banks.com or lendingtree.com? What's your experience? Is it bad to deal with lenders that aren't in your state?

Any experiences or advice you have would be great!

Thanks.