This may sound like a salespitch but I read the sample chapter as well. I am so glad somebody actually is writing a book on the Tk interface to perl. I have been programming in it for about 6 months and it has been a bit frustrating at times to use some of the widgets (the way one wants) since the only info previously was the FAQ and the newsgroup and then again who wants to keep searching for answers for each and every qirk of Tk...

I've like to see some good coverage of text tag manipulation (some people want to write editors)

Also, how to write modules for composite widgets. Particularly, how to pass widget params. (ie write a module for some popup and how to pass params between it and a main program). Its different slightly for widgets as I heard.