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Brooks B66 & B67
Note B67 has a rail mount so you can micro adjust the saddle. B66 is fixed position.
Another site on leather saddles
For those wanting a sleeker look (not a Waffenrad but an Achielle http://achielle.tumblr.com).
The saddle is a Brooks Colt - you can see this on Rad 1 in Pimp your Rad.
Also the Brooks Flyer Special is worth a look. Rails for micro adjust and a sleek profile - in between the Colt and the B66/67. The copper studs also look the bomb...
Saddle history in detail:
There are of course those, which are rare, but you might find them uncomfortable due to the philosophical implications and historic connotations, such as this one:
Crazy saddle - Would you try?
Styria Sattel / Styria Saddle - Waffenrad