I recently noticed this book,
by Microsoft, on Perfromance Testing using ACT. The book was recently published (September 02) but as I have not read it I can't give it a recommendation. It is, however, the only book I have found that focuses exclusively on ACT and Performance testing.
If anyone reads this book, I would be interested in feedback, also if anyone knows of other ACT books please let me know.
[This message has been edited by Ian (edited 11-12-2002).]