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Apple's new, faster 3G iPhones go on sale in the U.S. tomorrow, but a new store where Apple will sell third-party iPhone applications opened for business today. (Something to do with when the iPhone 3G went on sale in New Zealand. Those international date lines are so confusing!) The apps mostly range from free to costing $10, and you buy them on iTunes like you would an album or a TV show. Here are ten that will crush your last remaining resistance to Apple CEO Steve Jobs's demands.

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Sure, my Sanyo phone has an AOL Instant Messanger app. But it takes two and half minutes to send a message and then another two and a half to see if I got one back. Here's a new version for the iPhone, which could put an end to expensive text messaging. An alternative: Facebook's new iPhone app integrates the site's new chat feature.

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Remember radio? That place where you could listen to and discover music without paying for it? It's back.

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FileMagnet lets you load and view PDFs and Office documents from you desktop. Such a nice convenient way to keep you working all the time.

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This app, a guitar tuner that uses the iPhone's microphone, obviously targets a niche audience. We're betting the Edge asked Jobs for it

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This Major League Baseball app would be better if it streamed MLB.tv straight to your iPhone. It doesn't. But it does show game highlights not too long after they actually happen — which won't be a bad way to get through graduations, weddings and PowerPoint presentations.

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DutchTab takes the pain out of splitting a tab so you don't have to ask the server to do it. Only problem: greasy fingers on your iPhone.

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After using DutchTab to figure out how much you owe, send your friend the cash via PayPal. Seriously, in 2000, the folks at PayPal thought this was how people would use the service rather than to settle eBay auctions. The future is here!

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Always be closing, right? Keeping your leads' contact info in your pocket at all times will at least get you the steak knives.

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Muxtape founder Justin Ouellette showed us what can go wrong when you have to email blog posts from your iPhone instead of being able to use an app like TypePad. (If you upload the wrong file, you still might end up blogging your deal memos by mistake, though.)

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The oversharing generation's perfect app. Opt in and your friends will know where you are at all times.