Hi!
I think RapidPHP and other programs lack this feature of showing tabs without click on show hidden characters.
Quanta Plus does this using comma-chars like:
http://img135.imageshack.us/my.php?image=tabsyp5.gif
Notepad++ does this using a little vertical bar
http://notepad-plus.sourceforge.net/com ... rotate.gif
I think it's a good way of see blocks of ifs, cases, and others.