Well, with the release of Lotus Notes 8, Lotus Sametime Connect 7.5.1 and Lotus Symphony all based in Eclipse SWT and Eclipse RCP, it seems that this bounty can get more interesting.
FYI. This is the SWT web page:
http://www.eclipse.org/swt/Currently there are versions available for Windows, Linux (x86, PPC, x86_64, s390), Solaris, MacOS X and AIX.