In your profile page and the quicklinks dropdown, there are links to all threads started by you and to all posts made by you, but there isn't a direct link showing what you're looking for.
However, you can manually follow the following URL (or bookmark it) and you'll get what you wanted:
http://www.pentaxforums.com/forums/search.php?do=process&showposts=0&starteronly=0&ex actname=1&searchuser=rayallen
I'll consider making this a profile link in the future
