In this article at Macworld, now updated for the third-generation iPad, Dan Frakes runs down all the possibilities for charging an iPad — wall chargers, high-power USB ports, and low-power USB ports. If your iPad takes longer to charge than you think it should, make sure you’re using the right port and giving it sufficient time. follow link
Improve Apple Services with AirPort Base Stations
You can make iChat file transfers, iDisk, and Back to My Mac work better by turning on a setting with Apple AirPort base stations released starting in 2003. Launch AirPort Utility, select your base station, click Manual Setup, choose the Internet view, and click the NAT tab. Check the Enable NAT Port Mapping Protocol (NAT-PMP) box, and click Update. NAT-PMP lets your Mac OS X computer give Apple information to connect back into a network that's otherwise unreachable from the rest of the Internet. This speeds updates and makes connections work better for services run by Apple.
- ExtraBITS for 2 April 2012 (02 Apr 12)
Dan Frakes Explains iPad Charging Issues at Macworld