You can navigate among the Project Properties windows by using Ctrl+PgUp and Ctrl+PgDn. Why? because the project properties window is obeying the Window.PreviousTab and Window.NextTab commands. 

This blog post has moved to http://saraford.net/2008/12/02/did-you-know-you-can-use-ctrlpgup-and-ctrlpgdn-to-switch-among-the-project-properties-tags-369/