Thank You Letters for Sponsors - Help?

[onecoolc]

'Ello.

Me and Mayde (her username is mayde) have been stuck with the task of writing formal thank-you letters for our team's sponsors, but I'm not quite sure how to start. I want to write letters that are personalized for each company, as doing any less seems like a cop out, but I think having some sort of outline or standard introduction would make the proccess move along much smoother.

So, I was wondering if anyone would be willing to post their general out line or a few helpful hints and tips? Any help is much appreciated!