As a small supplement to yesterday's post, here's an additional brief notice of some collaborative work at nomisma.org.
http://nomisma.org/id/igch0546 is a stable URI for hoard 546 as found in An Inventory of Greek Coin Hoards. If you scroll down you'll see there is a map. The text was contributed by the ANS. The lat-long info by colleagues in France.
http://numismatics.org/cgi-bin/nm-search?kw=gml%3Apos will get you a list of all the hoards for which we have geographic coordinates. That URL will change but works for now.
This is all still highly preliminary, but the data is available and already somewhat useful.
In other ANS matters, our main website is coming along, and there is a new website for the ANS Magazine.