About.com: Portland, Maine
Conveys details on what to do in Portland, including hotels, restaurants, bars, attractions, events, and shopping.
Everything Maine: Greater Portland Casco Bay
Sponsored by the Convention and Visitors Bureau of Greater Portland, whose mission is to stimulate the economy of the region by promoting conventions, meetings, groups, and visitors. Vacation package, coupons, and calendar of events.
Maine Resource Guide: Portland
Conveys information of interest to visitors, including vacation and travel, maps, area attractions, and general interest.
Wikitravel: Portland (Maine)
Encyclopedic resource highlights information for visitors to the city, including travel choices, what to see, what do do, and where to stay. Presents contact details.