I have avoided Plants vs Zombies because I understand it’s very addictive.
However, I’m totally addicted to Flight Control HD. A great game.
For other games, the cream of the crop on my iPad are Pinball HD, Angry Birds HD, Real Racing HD, Zen Bound, and Astraware Solitaire and Sudoku. Astraware has the best UI designers around when it comes to solitaire and Sudoko - their games are filled with little usability tweaks that make them really enjoyable to play. And they’re cheap - $1.99, as I recall. I paid $14 for Astraware solitaire on my Windows Mobile phone, and the iPad version is much better. If you like solitaire or Sudoku, those are the ones to get.
I’ve also got X-plane, a great flight simulator. Again, the iPad version is much cheaper than any other version, and it’s amazingly full featured.
For productivity apps, I’ve got the following:
Pulse - a great visual RSS reader. It caused a recent controversy when Steve Jobs demoed it at WWDC, and the New York Times got mad because the reader was using their paper for its demo and shipping it with a link to the NYT newsfeed. So the Pulse guys took it out. Stupid New York Times. Anyway, it’s a great RSS reader.
Amazon Kindle App. Basically, it turns your iPad into a Kindle, except with a color display and backlight.
Zinio Magazine Reader. The app is free, and you can subscribe to magazines. They’re much cheaper than the newstand versions. I just bought a year of Car and Driver for $8.47, which is not much more than the price I pay for a single issue in Canada. There are hundreds of popular magazines available to buy for various prices.
Weatherbug. Awesome weather display app that integrates with Google Maps and allows you to overlay actual weather radar information.
Dropbox - best way to get documents on and off your iPad
Sketchbook Pro - Autodesk’s sketching/painting application for iPad. Very powerful.
The Elements - the best demo of the iPad you can get. And you can learn a lot from it. But it’s pricey - around $15.
Evernote: A note-taking app that automatically syncs to the cloud. Install the client on your iPad, your PC, and you’re phone, and you’ll always have a database of notes available to you no matter which device you’re using and which one you wrote the note on. For example, i can make a grocery list at home on my PC, then read it on my phone when I’m shopping. No file transfers or computer syncing required.