retrieve a list of all distinct/unique resources in a store/repo

Hi all,

Trying to get a one dimensional array of all unique/distinct resources in
local store regardless be the resource a subject, predicate or object.

To emphasize. I don't want distinct triples, I want distinct resources
(excluding literals and blank nodes).

Both SPARQL-y and non SPARQL-y (Ruby RDF) answers welcome.

Thanks!