Visa's, Credit Cards, and Moneys (aka the boring stuff)

Smart Card - A card-based method of funds

Cash Passport - A card-based method of funds

Trevelex - Currency, cash passport, insurance (less than 180 days), etc. (Experts at the boring stuff)

Travisa Phonecard - International phone card from MCI

Travisa STA - Visa and passport information

Ekno Global Phonecard - A Lonely Planet suggested rechargeable phone card

Virtual Costa Rican Embassy - All you need to know about visa's and such for Costa Rica

Helpline Database - Worldwide Embassy guide

US Dept of State - US government explains things from their standpoint - among most useful

AT&T - International Phone cards and numbers

US Embassy's Abroad - The US State Department list