Apple's iOS 4 has arrived, bringing multitasking and more to iPhones and iPod Touches everywhere (iTunes willing). Here are the apps that already take advantage of the new OS, and some that should be hitting the App Store soon.



In the App Store NOW:
• Dropbox - Sync your Dropbox files in the background.
• Evernote - Download and upload notes in the background, and continue recording voice notes while you're messing around in other apps.
• Zagat
• LinkedIN
• How To Cook Everything
• Trapster - Background locations
• Bejeweled 2
• DocsAnywhere
• Motion X GPS - Record tracks in the background; hear background voice coaching.
• TuneIn Radio
• OffMaps
• WeightBot
• Wordpress - Fast app switching, Retina Display optimized
• TomTom - Background navigation directions
• DiveLog
• textPlus
• Plants vs Zombies - Fast app switching
• Radio Box
• NYTimes
• Last.FM
• Tripit
• ESPN ScoreCenter
• Colloquy - Multitask ready and optimized for the Retina Display.
• FlightTrack Pro - In-app SMS flight sharing
• Pandora - Play your Pandora music, WHILE DOING OTHER STUFF! Essential.
• Pastebot
• ooTunes Radio
• RunKeeper
• Promodoro
• Tap Tap Revenge 3
• Twitter for iPhone
• Rooms for IRC
• Ustream Viewing Application
• TomTom US & Canada

Hitting the App Store with iOS4 updates soon:
• Navigon - Navigon will keep shouting directions at you while you're working in other apps.
• Skype - Will soon let you multitask while talking to grandma.
• MyPhoneDesktop
• Nap App
• Occasions - Local notifications
• MotionMeter
• Batting Goggles
• Amp Music Player
• Slacker Radio - Slacker Radio recently got caching, and soon it'll get multitasking support as well.
• PlaceTagger
• Rockola.FM
• Task Aware

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Know of other apps that are taking advantage of iOS 4's multitasking, local notifications, or fast app switching? Let us know and we'll update this post.