Rex - Click this link for info on how the Community Development Districts operate:
http://www.districtgov.org/faq.aspx See the section "The Cost of a CDD" regarding the annual maintenance assessment. It also references the bond associated with each lot/house as well.
The annual maintenance assessment on our Patio Villa in Duval (CDD 7) last year was $262.26 (one-time fee per year).
Hope that helps!
Bill