My article,
Replacing TabSheets with Frames is now up on the BDN website. This article summarizes issues that you will likely find when designing an application using TPageControl components. The article presents some background information and solutions to problems by using TFrames, interfaces and inheritance. Give it a look, and leave any comments here (or on the BDN site). Be sure to rate the article, too!
Now might be a good time to subscribe to the Delphi BDN RSS feed, too.