In general, magnetic screw mats really help with keeping screws organized.
If you're looking for an iPhone-specific solution, you might like the magnetic screw mats that iFixit sells for the CDMA (Verizon/Sprint) iPhone 4, the GSM (ATT) iPhone 4, the iPhone 3G/3GS, and the iPhone 4S.
For a more general solution, there's this magnetic organizer mat. It even has little trays for non-magnetic parts :)
Edit: I've used magnetic mats in my repairs, and have never had a problem with them. To be on the safe side, just keep the LCD and battery off of the mats, and you should be fine. The magnetic field from these type of mats isn't strong enough to damage things from a distance. :)
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I use double sided tape..stick the screws head down on a diagram of where they go, makes pick up easy & if you use left hand pick up/hold phone on table, right hand magnetised screw driver. I don't think I'm quick but it saves the frustration of having all the screws lift up with screwdriver. I'm happy being slower and more careful than being fast and making a mistake that'll cost me money to fix. (says she who has spent the morning trying to stick an LCD flap back on an ipod 5th video because she tried to rush!!)
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