A few times a day if I'm around the computer, DNForum is great. Like to check the lounges, news, domains wanted, .ca thread, appraisals... I only learned of this forum about a year ago, would have liked to have known about it much earlier. You can learn so much here about the domain business. Looking at the domains wanted and domains for sale sections really helps me to see what kind of domains are in demand (.com .com .com). I also like to check out the daily sales list at Afternic, and the weekly sales report at dnjournal.