The wxPython community now has a 2nd book about our favorite UI toolkit. The book is "wxPython 2.8 Application Development Cookbook" written by Cody Precord and published by Packt Publishing. Cody is the creator of the awesome Editra source code editor and a frequent participant on the wxPython-users mail list. There is an eBook version of the text available from Packt Publishing, and you can get the printed version from Packt or from other booksellers such as amazon.com.
I haven't read all the recipes yet, but from what I've seen so far I can say that they are informative and do a good job of explaining the demonstrated techniques and the concepts used or implemented in the sample source code. I think that there will be something for everyone in this book, from newbies all the way up to experienced users.