The journal Dr. Dobb's has just published an introductory article on DDS. If you're new to DDS or to real-time communications in general, take a look. It's a quick read, and it does a good job of summarizing the rich functionality of DDS and the impressive performance relative to other technologies. (Note that the article was written by another DDS vendor, and the author chose to use some IDL and C++ syntax in his example that's specific to his implementation. That's a detail, though; the concepts are the same across all implementations of the standard.)
Click here for more articles on DDS. Click here for whitepapers on DDS, including a link to the Embedded Market Forecasters study that finds DDS middleware from RTI improves ROI when compared with other alternatives.