ResearchBuzz pointed out an excellent resource called NumisLinks
for coin collectors. Those working in public libraries often get questions on pricing of older coins. NumisLinks can provide useful assistance to those seeking information about coins in public libraries as well. According to ResearchBuzz, 'The site divides its links into lots of different categories including ancient coins, banknotes, software, and grading. Categories with new listings are marked with a large red icons. Interestingly categories are also tagged with how many views they're getting, which shows you at a glance what the visitors are finding most interesting.' More information from ResearchBuzz can be accessed at Searchable Subject Index for Coin Collectors.