Many of the comments here focus on the fact that: 1) There are traditional options that the author didn't take the time to search through and find. 2) Or the author missed an opportunity to go with a free solution.

I feel these comments miss the point of the iPad's success.

The argument this article makes is that the iPad creates a friendlier, clearer, and more usable application ecosystem. The lack of search clutter (from the flurry of links posted) is the actual benefit here, with the ability to create a cool mock-up on the fly an added plus. The community voice is a trust-worthy one. And though it may have cost $8, there was no negative outside of this (ads, malware, bad app).