If you have an encyclopaedic thirst for knowledge on all things related to Cairo, then touregypt.net won't disappoint. Every building that might possibly catch your eye is chronicled with a snapshot, then linked to a map, so it's easy to pinpoint at street level. It's a great way to discover bits 'n' pieces that aren't on the tourist trail such as El-Ghuriya, in the heart of Islamic Cairo, where you can watch folk musicians and the mystical whirling dervishes spinning themselves into a meditative trance.
They've also come up with ideas for days out when the pace of city life gets too much - How about a round of golf at the famous Mena House course overlooking the pyramids or a flutter at the Gezira Club horse track? Where the guide really comes into its own is with Central(modern) Cairo. Peculiarly overlooked in most guides, this is the district where most visitors stay, business gets done and the nightlife really kicks off.