DotNetNuke development services for DNN include:
Product Design and Analysis
Incremental Development Approach
Full Product Testing Cycle
Customization Services
Localization Services
Integration Services
Product Support

DNN custom module development technology list:
.Net application development based on Framework 1.1 or 2.0
MS SQL 2005, MS SQL 2k, MySQL database design
HTML, XML, JavaScript, AJAX and more
Security testing by Web Inspector
Performance testing by LoadRunner or SilkPerformer
Custom Skin Design by Adobe Photoshop