In reply to Information about "Triplex Serif" font:
Maybe you're thinking of Today Sans?
http://new.myfonts.com/fonts/efscangraphic/today-sans-sb/
One of the (many) things I love about Triplex is that the roman and italic were designed by two different people: Zuzana Licko did the roman (and slab serif); John Downer did the ital that inspired her. Just like the days before romans with matching italics.
Does anyone else think the OT versions of the faces seem to have been revised? They seem different from the PostScript 1 originals, but maybe that's just me.