Introduction to WinBUGS for Ecologists is a good practical Bayesian book. I find the sample code very useful. The simple example of forming predictions (p. 116) is straightforward and can be easily tailored to be used in different research situations.
Doing Bayesian Data Analysis: A Tutorial with R and BUGS is another useful practical Bayesian book. My copy just arrived today. Can't wait to play with some of the examples there.