Sending the letter is a great idea. It shows you have done "due dilligence" on your part.
From my understanding, in order to use fonts in your artwork (that you sell) you have to have a commericial license....which usually is expensive. This is the main reason I rarely use title art in my kits that I sell.
Try checking out
www.dafonts.com and see what they say--I'm pretty sure they sell commercial licenses.
FYI-
Roseanne
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Roseanne
232 digi layouts so far in 2005

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"Creative expression is at the root of one's physical and emotional well-being"