Put this on the top of the, “Most impressive things I’ve seen today!” list. Alex Wolkov has taken an iPad, and simulated it virtually with JS & CSS3. Launch apps, surf inside the iPad with a web browser, and even launch the multi-task bar with the home button. Quit apps, delete others, and shuffle icons around just as you would on a real iPad. This is all in web code, and the project is open-sourced on github so you can take a gander. Fair warning, make sure you have a relatively good screen resolution on your monitor so you can view the iPad in full while you play around.
[iPad Simulator via Forrst]