FYI, I've seen comments on some other boards that Continental (now with two daily flights a day to Belize City) is offering some attractive deals on fares -- something like US$189 R/T (plus taxes) from Houston. I don't know if these fares are available through travel agents or just on CO's Web site. If you're going to Belize, it may be worth checking out.
Belize First Magazine
Web edition at http://www.turq.com/belizefirst/