How do you approach buyers? (email, fax, phone etc.)
What do you send/say initially? (brief email, price info, background to the domain industry, industry sales data, price justification, deadline, explanation of the sales/transfer process, benefits of domain name ownership etc.)
How do you structure a sale? (first to offer asking price gets it, open auction, sealed bid auction, offers over $X, etc.)
Did a particular approach work very well? If so, what was it (if you can say)
Did a particular approach fall totally flat? Likewise...
I sell a good number of domains "reactively" (i.e. from walk-in enquiries or in response to "Wanted" posts on discussion forums) and via domain for-sale forums, but I figured it was time to step up a gear and go after those elusive end-users!
Why do "they" want to buy? Are you selling traffic? Is your argument "You will have to pay X amount to SEs for this type of traffic so buy this domain for $$$ and you are ahead on the numbers." Does the domain have traffic because it's a generic expression of an industry relevant word/phrase, one that is likely to convert?
Good luck trying to sell "brand domains". You'll need it IMHO. However, if brand=generic industry domaina/phrase = valuable traffic then it will be a numbers game in selling. Find the person that grasps the numbers, who can then sell the idea to the company . . . IF he/she is secure in their job.
Bottom line: The best buyers are always the buyers that find you. Domain sales mostly remains a pull, not push, business.