RPi Easy SD Card Setup - eLinux.org

Note: If a Netgear router has a blank in the fourth box of the subnet mask, raspbian will
interpret that as a 255, not as a '0' like Ubuntu will do. This will give you a subnet mask
of 255.255.255.255 and a useless network connection. Changing the router's setting to
put a '0' in the last field and reinitializing the network will fix this.
USB-Hub
In order to connect additional devices to the RPi, you may want to obtain a USB Hub,
which will allow multiple devices to be used.
It is nearly a requirement that a powered hub is used - this will provide any additional
power to the devices without affecting the RPi itself. The USB ports are fused at about
140ma each without an additional external power source. This not enough to power a
hard drive, and you may even have trouble powering wireless adapters and other
peripherals. There is enough current out there, however, for mice and most keyboards.
(see RPi Hardware - Power section).
USB version 2.0 is recommended. USB version 1.1 is fine for keyboards and mice, but
may not be fast enough for other accessories.
Heatsink
Not a vital accessory for your RPi, but will help to reduce the CPU's temperature whilst
under load. Available from Etsy (http://www.etsy.com/shop/nhslzt) The Pi Hut's
Raspberry Pi Store (http://thepihut.com/collections/heatsinks) or eBay
(http://www.ebay.co.uk/itm/330758220781)
Case
Since the RPi is supplied without a case, it will be important to ensure that you do not use
it in places where it will come into contact with conductive metal or liquids, unless
suitably protected. Some form of case should be considered, and there is a Rpi case
thread (http://www.raspberrypi.org/forum/general-discussion/cases-for-the-raspberry-pi)
on the forum. Cases are also available from The Pi Hut's Raspberry Pi Store
(http://thepihut.com/collections/cases)
For detailed information see Rpi Cases.
Real Time Clock
There are a number of possible solutions for real time clocks, but so far, most are either
expensive or not particularly friendly.