In my opinion, the following links are very useful for collectors of all levels from beginner to very advanced one. I would like to recommend you to visit below sites if you didn't do it yet.

I would recommend also to visit sites of collectors from Collectors page of my site. Some of them have simple beatiful and useful sites that will not be listed on this page, but contains much more things then just "about me", "swap list" and "trader list".
 

Links for coins and banknotes collectors

History and Photo Catalog of World Paper Money   Don's World Coin Gallery   The largest collection of full color coin images in the World listed by countries and by KM#. Krause-2005 value has been added. Very easy for navigation.   www.numismaster.com   Based on 50-plus years of Krause Publications data and updated daily by a team of experts, NumisMaster price guides are the only source you need to find current coin prices and keep your coin collection's value up to date.     Numista   Looking for information about a coin or to identify an unknown coin? Find it among 140,000+ world coins in the collaborative coin catalog, built and constantly enriched by the Numista community.   COUNTRIES OF THE WORLD WHICH ISSUED COINS   The homepage of Gijs Vlothuizen. The largest catalogue of technical data (diameter, weight) of coins in the World listed by countries and by year issued. Krause value depending from grade has been added. In this on line catalogue included all countries which issued coins, but not all coins (especially commemorative) unfortunately.    wwc.coins.ru (on Russian)   World Wide Coins - catalogue of world wide coins by countries with details about persons represented on coins. More two years non updated.     Bank note museum   The best site of all banknotes with all variants and best scans.   images of old and recent world paper money listed by countries

  World Currency Gallery

Many useful information about banknotes collecting. Thousands of images. Great graphics and easy navigation.

  Central Bank Websites

Contains links to most websites of Central Banks in the World.

  Russian Central Bank Website (on English)

Description of Russian coins and banknotes (circulation and commemorative).

  Coins of CIS and Baltic countries (on English)

online-catalog of regular coins that were issued at the territory of former USSR since 1991.