I miss the text-only adventure games; all these
graphics intensive
point-and-click games these days just arn't the same.
You're in luck, since even more text-only adventure games are being
written now than back in the heyday of commercial text adventures.
And they're free (as in no charge). The quality is really variable,
but that was true of the commercial stuff as well.
Check out the Interactive Fiction Archive:
http://ifarchive.org/
And the newsgroups rec.games.int-fiction and rec.arts.int-fiction.