Shopping in iTunes
You can also download new programs to your computer, using iTunes, and then sync them over to the phone. By all means use this method whenever you can. It's much more efficient to use a mouse, keyboard, and full screen.
In iTunes, click Store (in the Source list). In the iTunes Store box, click App Store.

Now the screen fills with starting points for your quest. There are Top 10 Lists (meaning most popular), a Categories list, What's New and What's Hot listings, and so on. Start clicking away to browse the store.
Or use the Search box at top right. Be aware, though, that whatever you type here winds up searching the entire iTunes Store, complete with pop songs, TV shows, movies, and so on. The results are grouped by category, but in general, you might be better off clicking the Power Search link below the Search box. It lets you limit the search to iPhone apps, to free ones, to iPhone-only programs (as opposed to ones that also work on the iPod Touch), and so on.

From here, the shopping experience is the same as it is on the phone. Drill down to the Details page for a program, read its description and reviews, look at its photo (actually, you get to see several screenshots here, rather than the one you see when you're shopping on the iPhone), and so on. Click Buy App ...
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