Like Mark says, lots of different ribbons, but in general you can say that no other mic sounds alike. Ribbons have a special sound, very smooth and I've learned from Harvey (the Harvmaster) that you can't overload a ribbon in the highs like you can very easely with a condenser. Try recording a tamborine close to a condenser and listen how ugly that can sound.
I have very nice sounds from trumpets and other horns, acoustic guitar, violin, acoustic bass, close micing hi hats and ride cymbals and some vocals (be sure to use a good screen). Even on a very good dynamic like a Sennheiser MD441, a trumpet can sound too brittle.
A ribbon mic can be your secret weapon.