It's unbelievable: from Monday on, you will be able to use a real Lotus Notes client on Linux!
Think about it: Lotus Notes hasn't been available for more than a few years (Notes 3.0 was released 1993) and the Domino server has just been made available for Linux (in 2003) -- and already, there's a native client for Linux!
IBM certainly is an early adopter. :-)
PS: If you'd like to take a look at the history of a software that has been there forever, see The History of Notes and Domino