Assuming you're not already a druid, you can get newsletters from
contemporary Druidic organizations (Druid High Days and Ar nDraoicht
Fein). The addresses are in the back of Margot Adler's book
_Drawing Down the Moon_ (1986). It's also got a number of other
contact groups for those interested in "neo-paganism,' including
a number of Celtic-oriented groups.
As far as the oral tradition for Druids--my understanding is that
contemporary groups are revivals of a somewhat edited druidic
tradition, and really make no claim to continuing an unbroken line
of druidism from ancient times. Any druids out there, feel free
to correct me on this.
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