Edinburgh Council is spending £80k on events including a "youth summit", £30k on branding & marketing & £10k on providing information.
They've set up a special phone line with L&B police (0131 200 2343) and a couple of websites to provide infoirmation for residents on road closures etc:
http://www.lbp.police.uk/g8
http://www.edinburgh.gov.uk/g8summit