Currencies of the World
- List of currencies used in various countries.
- http://www.tipsofallsorts.com/currency.html

Transaction Net: How Money Systems Work
- Overviews of how various currency (money) systems work, featuring a glossary and chart comparing the features of different systems.
- http://www.transaction.net/money/

Currency Boards and Dollarization
- Information about currency boards, their history, how they work and understanding them.
- http://users.erols.com/kurrency/

S-WoPEc: Economic Structure and the Decision to Adopt a Common Currency
- Extensively examines the question of whether given countries should adopt a common currency like the Euro
- http://swopec.hhs.se/iiessp/abs/iiessp0611.htm