If you are running iTunes 9.1 on your Mac, have a look at your apps section.  Has it changed?  We have just noticed that our apps section when viewed as a grid is now split into three areas:

• iPhone, iPod Touch and iPad apps (we are guessing these are 'Universal' apps
• iPhone and iPod Touch apps (non-iPad apps?)
• iPad apps (designed for the iPad only - if you have any downloaded)

This is interesting because it is really not clear which apps are iPad only or Universal in the App Store in our opinion.  Although this categorisation will only show on apps you have on your computer, it is at least a start to making sense of the (in our case) hundreds of apps kicking about on our hard drives for testing purposes, or just in case we need them some day.