It took me a minute to figure out how to use the right mouse button with the QwasiPad application on my iPod Touch.
All you have to do is tap the screen with two fingers. It works really well every time.
QwasiPad is an application I installed on my iPod Touch to act as a wireless keyboard and mouse for my Windows Vista computer which I have attached to a Plasma TV mounted in my wall. Its nice to not have to have another device near me (wireless keyboard) when I want to control the PC.
QwasiPad will also work in landscape mode by simply flipping your iPhone or iPod Touch on its side. This makes it easier to control a wider area on the computer.