I have a Louis Vuitton Monogram Canvas passport holder which I like a lot. It has two slots, one for the passport, one for eventual tickets (train eg), three credit card slots and another slot for bills or miscellaneous papers.
I vote for Smythson as well. It has got such a rich heritage and I especially love their first and most beautiful Bond Street Store. The leather is hard-wearing and of fantastic quality. Their products are beautiful and very durable! Love love love their exotic skins as well!
The Hermes ones are nice. I was going to get one but instead I got the Globetrotter Zippered Agenda and use that to carry travel documents. If you want to splurge the agenda is amazing...I carry my life around in that thing.