Tourist Information can be obtained at:

• Lisbon Airport - open 06.00 to 01.00 (following day) every day, including weekends.
  Tel: +351-218 494 323 or +351-218 493 689
• Palácio Foz on Praça dos Restauradores - open 09.00 to 20.00 every day, including weekends.
  Tel: +351-213 466 307 or +351-213 463 314.
• Lisboa Welcome Center on Praça do Comércio - 09.00 to 20.00, Monday to Saturday.
  Tel: +351-210 312 700
• Tourist Helpline - 800 296 296 (in Portugal).

Official Guides:

• VisitPortugal.com - Portugal's official tourism website (in Portuguese, English, Spanish or German) has many tourism resources and very useful information on passport and visa requirements, health & emergencies, etc.
• Turismo de Lisboa - a very comprehensive guide (in Portuguese, English, Spanish, French, Italian or German) . Gives information about Lisboa Card - free entry to 26 museums, monuments and other places of interest which usually charge an admission fee, plus free access to public transport on buses, trams, lifts and underground (for 1, 2 or 3 days). Please note that public transportation is cheap, anyway.
• Lisboa - the Lisbon City Council's Guide (in Portuguese, English, Spanish or French).

Guidebooks available online:

• Rough Guide
• Lonely Planet Lisbon and Portugal
• Timeout Lisbon

Other online Guides:

• Clix Travel Guide - an up-to-date Portuguese online guide, with extensive accommodation listings, restaurants, transport and activities (in Portuguese, English, Spanish or French).
• Portugal Virtual - click your way through hundreds of accommodation resources, tourism guides, sights, activities, museums, shops, etc (in Portuguese or English).
• travel.org-Portugal - has a list of tourism related links (in English).