A Special Proposal for a Special Person

I want to propose to the woman I have been dating for the last ten years, and I really want to make it special.  I want it to be something she will remember forever, regardless of what else happens.  Can anyone tell me the best way to propose to someone?  I could really use some creative and romantic proposal ideas.  I am trying to think of some way to tie it in with our dating experiences or where we first met, but so far I haven’t been able to come up with anything good on my own.  I am hoping I can find a website or something that will give me some ideas I can work with.