iClarified – great resource that is well edited, well maintained, and easy to use is http://iclarified.com. This site is clean and concise; they also operate their own iPhone application repositories for both installer.app and Cydia. Below is a screenshot of the site.
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To copy and paste text between applications is probably one of the most wanted app by iPhone users. Copy and paste. Until iPhone os 3.1, it was the most glaring feature missing from apple’s otherwise killer device. it’s present on practically every other smartphone on the market, and has infinite applications of convenience, as any journeyman computer user has discovered. so why go without it on a portable master communication device? the Clippy application gives us the copy and paste that iphone os 1.x/2.x owners had been clamoring for. …

To play DVD on iPhone is possible. A free software program called Handbrake (http://handbrake.m0k.org/), available for Macintosh and Windows, can convert DVD movies into the .mp4 files that can play on your iPhone. and a $30 apple program called QuickTime Player Pro, also for Mac and Windows, can convert dozens of other formats into iTunes/iPhone-compatible ones.
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On the iPhone. You can delete an app from the iPhone easily enough. Just hold your finger down on any Home-screen icon. After a second, all the icons begin to jiggle; you’ve just entered Home-screen Editing Mode.
A tiny X appears on the top left corner of every app you’ve installed. Tap the X on the app you’re done with, and then tap Delete to confirm. Now it’s gone—at least from the iPhone.
Note, however, that if you’ve synced your iPhone with iTunes since downloading the app, there’s now a second …

The iPhone 3Gs’ battery life is either terrific or terrible, depending on your point of view. When accessing the 3G network, it gets longer battery life than any other phone—and yet that’s only 5 hours of talk time, compared with 8 on the original iPhone.
But never mind all that; the point is that if you’re not careful, the iPhone 3G’s battery might not even make it through a single day without needing a recharge. So knowing how to scale back its power appetite could come in extremely handy. The …