Artur's Paper Money.
Excellent publications, covering the paper money, used in Latvia. The point of view of experienced paper money collector.

Russian Coin & Banknote.
Brilliant website by Sadanori Sekine, showing the distinguished coins and banknotes from his collection.

Ancient Greek & Roman Coins.
My favorite ancient coins site, created by Doug Smith. The best explanations on Ancient coinage, I have seen on the Web so far.

Early Islamic Coins.
The source with wide information on different periods and areas of Islamic coinage by James N. Roberts.

The Coins and History of Asia.
The site by Thomas K. Mallon-McCorgray, recommended for everyone, who is looking for information on coins from Asia.

Mazzi Michele's Currency Pages.
A big collection of coins and banknotes from around the world. Swap lists and many links to other sites.