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Onavo

Free

Pimp Your Screen

99 cents

Wikipedia

Free 

Instagram

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Skype

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Skype

1Password

$9.99

Mint.com 

Free 

The website and service Mint.com helps you keep detailed account of your finances by connecting to your bank and credit card accounts and tracking all the money you earn and spend. The Mint.com iPhone app extends the experience so users can keep an eye on their spending better while on the go. Just enter a few data points in the iPhone as you spend, and you’ll be able to see your spending patterns as an easy-to-read chart.

MyFitnessPal

Free

iMovie

$4.99 

For iPhone 4 and later only

The iPhone 4's IPS LCD screen is remarkably sharp—even enough for video editing. iMovie for iPhone 4 is the first smartphone app that lets you edit video on the go. For about five bucks, the app is surprisingly peppy and worth a look if your video editing needs are very basic. One caveat: Don't try installing it on any device older than the new iPhone 4. You'll just lose your money.

Adobe Photoshop Express

Free

Digital p

24. Red Laser

34. Dragon Dictation

37. Zoopla Property Search

There are loads of property search apps on the App Store, but Zoopla is the best of them. Its listings are comprehensive and there's also local market data, including local sale prices and estimates on market value. The location button is a bit rubbish, but the app soon finds properties when you manually type a location.