The posts so far have been pretty reasonable, but to ensure we don't get worse I'm going to give a rough template of what information we and the domain name buyers will be expecting.
Post Template (* denotes information that is very important)
Topic Title: Selling {domain name(s)} [{sale type}]
Notes: {domain name(s)} is obvious, but {sale type} less so, it could be one of auction, BIN or other.
* Domain Name(s): {domain name(s)}
* (Base/BIN) Price: ${price} USD
Notes: remember to specify the type of currency, $ is not entirely clear. It could be USD or CAD or other.
* Purchase Date: {date}
* Expiration Date: {date}
* Registrar: {registrar}
* Form of Payment: {payment option}
Notes: paypal, bank transfer, etc
Full Whois Info: {link to whois data}
Notes: you can use http://whois.domaintools.com/ for this.
Popularity/Hits per day/week/month/other: {information on popularity or a numeric of the average hits}
Notes: graphs and other statistical data might be useful here
Reason for Selling: {your reason}
Additional Information: {info}
Fake Example
An example of how this might be done:
Topic Title: Selling domain.tld [BIN]
Domain Name(s): domain.tld
BIN Price: $50 USD
Purchase Date: 2007-09-21
Expiration Date: 2010-09-21
Registrar: NameCheap.com
Form of Payment: Paypal
Full Whois Info: http://whois.domaintools.com/domain.tld
Popularity/Hits per day/week/month/other: Blah blah blah stuff about visitors.
Additional Information: A nice domain, blah blah
That's it! Good luck with your sale.