Congratulations! I'm new to this forum as well. There is a ton of information on both the Dominican and Riviera Maya.
Some other places that have helped me as well are Reviews of vacations, hotels, resorts, vacation and travel packages - TripAdvisor and Debbie's Dominican Republic Travel Pages - 1,000's of Resort Reviews, Tour, Scuba and Wedding Information. Both sites also have forums, but not as good as this one