An "auction manager" feature would really be nice aroud now... I'd personally try contacting people directly before posting to the forum as if I'd had a hard time doing so. Usually you click your PM area "new message" and just type in their name. Make it a formatted PM too.
"Congratulations on winning MYDOMAIN.COM.
To complete your purchase, please..."
I've gotten some nice formatted e-mails from sellers. Even though it was clearly a "template", it still gave me the warm fuzzies.
~ Nexus