Astronut. I rarely play any games on my iPhone or iPad, but the funnest one I’ve bought lately is Astronut. The graphics are superb and it’s a lot of fun when you’ve got 5 or 10 minutes and need a break.
1Password is a fantastic tool for keeping any and all top-secret info available on my iPhone or iPad, and it syncs over the air via Dropbox.
Pastebot is a fantastic clipboard manager for your iPod touch. And it will pair with your Mac to make a dead-simple way for transfering text and images back and forth between the two. I wrote more about Pastebot here.
Twitter is the free and “official” twitter app for your iPhone and iPad. It also happens to be iOS’s best-of-breed Twitter app.
Reeder is a top-notch app for reading your RSS feeds. It syncs with your Google Reader account and has a clever and delightful GUI.
NetNewsWire is also a top-notch app for reading your RSS feeds. It also syncs with your Google Reader account. I absolutely adore NNW for my Mac, and the iPad version is fantastic as well.
ESV Study Bible + is my favorite Bible app for my iPhone and iPad. The free version is great as well, but this version comes with more content for studying, audio of the Bible, and a significantly better UX for taking notes within the app itself.
Instapaper is the best way to read the Internet. If you’re not already using Instapaper then you can sign up for free online, then buy the pro app (though there is a free version) and all the articles you elect to read later will show up in your Instapaper app.
Canned is an iPhone app that lets you pre-write the text messages you send often, and even pre-assign them to the individuals or groups of people whom you often send that text message to.
And if you didn’t actually get an iPad for Christmas but you got some cash and now you’re in the market, you may want to check out my iPad Buyer’s Guide.