Apple should actually give its users a sense of familiarity with something the users don't know anything about. The iPad is a perfect example. But some basic questions about the device remain unanswered.
Where will the missing iPhone apps show up?

When Apple announced the iPad, a few iPhone apps were missing. Weather, Stocks, Voice Memo, Clock and Calculator were nowhere in sight. We don't know if these apps will be excluded from the shipping iPad, but it seems unlikely. If they do show up, where? And how?
What does that blank key on the iPad keyboard dock do?

Apple plans to sell an accessory for the iPad that serves double duty as both a keyboard and a dock. The keyboard is pretty standard. But a mysterious key has iPad watchers baffled. A function key right above the number 6 on the keyboard has no label or graphic on it, and its purpose or function has not yet been revealed.

Will the iPad have free-floating windows?

The iPad is reportedly capable of running free floating windows (windows you can move around on-screen like a PC's, rather than windows fixed it place like the iPhone's.) But, will that be a standard way to view apps? Will the users be able to re-size any windows on the iPad?

Will iPhone apps run side-by-side on iPad?

Apple told that iPhone apps will run on iPad. But how? Will the users be able to run three apps side-by-side, in a multitasking mode? Will some of them show only an iPhone-size display in the middle of a dark screen? Will they run full screen, with giant icons and oversized menu text?
Will Amazon's Kindle app for iPad offer newspapers and magazines?
Amazon says it will offer a Kindle app for iPad, which means current Kindle owners should be able to buy and access their Kindle book libraries like they can on the iPhone. The question is, will Kindle users be able to access their newspapers and magazines like they do on the Kindle?

Will free Internet content cost money on the iPad?

Publishing companies and media companies are apparently giving the idea of charging for content delivered to iPads that they give away on the Internet. Associated Press also announced that its developing an iPad app that will enable them to charge for newspaper stories. Will iPad users be charged for content?

Creating applications in the dark makes it tough for iPad application developers to know how the device will feel in the hands and look to the eyes. So if you're an early iPad user, don't expect every iPad app to run flawlessly on day one.