Ethernet cable - Any shop at the Sofitel Plaza. You can get any customised length and they'll crimp the end connectors for you. Make sure you specify the configuration (crossed or straight). Approx price - Qr 25 for 10m.

Mobile - Check with Qtel for their free phone offer.

Bus map - I've seen it published many times on Gulf Times (every time a new route is added).

Cheers,
Keith