mollusc keys and discussion groups

[Warrington, at <PWARRING at EPDIV1.ENV.GOV.BC.CA>.bitnet>]

Can someone point me to sources of keys to the identification
of extant fresh water, terrestrial and marine molluscs world-wide
(apart from the popular shell collectors books)? Is there an email
discussion group on mollusc taxonomy and identification and if so
what is the address to subscribe?  Thanks Pat.