I booked our tickets for August, 2006 on Saturday.
Round trip, non-stop from DFW to MCO was just over $232 per person on American. That is the price the tickets have been for at least a couple of months. I started looking at tickets around the end of October, and I was thinking we were going in June. By the end of November we had switched to going in August, so I started looking at tickets for then. Same price no matter which flight or which day.
We booked our October, 2005 tickets in May, 2005 and by the time we were ready to leave the price had almost tripled. Once in awhile I will get e-mails from Travelocity with flights around $173 but they are always short notice and mid-week. Better to just get it out of the way, I think!