For more information on developing your own test strategy, you might find the following resources helpful:
Lessons Learned in Software Testing: A Context-Driven Approach (Wiley, 2001), by Cem Kaner et al., has an entire chapter dedicated to planning a test strategy.
Software Testing: A Guide to the TMap Approach (Addison-Wesley, 2001, ISBN 0201745712), by Martin Pol et al., also has a chapter on the topic.
"Test Strategy and Test Plan," by Jeff Nyman, is an excellent resource for more information on creating a test strategy.
Try the Heuristic Test Strategy Model (PDF), by James Bach.
For more information on the tools we used, look here: