On Actually Using a P-TTL Flash
This article is concerned with comparing the available P-TTL options. For information on actually making the most of P-TTL, take a look at OK1000's introductory guide to P-TTL and (particularly if you are having exposure problems) the P-TTL flash guide from Pentax User UK.
More Pentax Flash Information
Jens Roesner has a page full of information about the Pentax flash system. Some of it is slightly dated, but even those portions are useful for historical perspective.
Bojidar Dimitrov's Pentax K-Mount Page contains a section on flashes. This only covers Pentax-made equipment and focuses on history over current products.
Discussion Forum
I frequently visit the unofficial Pentax web-based discussion boards at pentaxforums.com. There's a lot of helpful and friendly people there. Likewise for the Pentax forum at photo.net.
