According to Michael Sampson's blog (http://www.michaelsampson.net/2007/07/mark-bennett-on.html ) a Lotus Notes 5 customer in New Zealand is planning a roll-out of Notes 8."All of the Domino Servers run on Linux, and they are considering the roll-out of some Linux desktops. In terms of Notes 8, Mark says, "What exactly do our people need beyond Notes 8, the inbuilt productivity editors, and a browser?" In other words, Notes 8 paves the way for a move away from both a Windows desktop and Microsoft Office."
See also the IBM web page discussing the IBM open client solution on Linux: http://www.ibm.com/lotus/openclient