One of the most successful commercial Linux initiatives last year was IBM's offering of Linux eServer partitions on its zSeries mainframes which can mount up to thousands of simultaneous Linux servers. Winnebago Industries and Korean Air are two high profile customers that already serve lots of Linux out of zSeries mainframes.
Now IBM is moving downscale toward smaller businesses, noting IDC's estimate that small businesses represent 48% of all Linux installations, and that small and medium sized businesses will account for over 50% of the worldwide server market in another two years. The company claims that over 200,000 customers around the world already run their business on IBM eServer iSeries, but they want to raise that number with a new offering: the Linux for iSeries Test Drive.
You can test drive Linux on an iSeies system with a choice of TurboLinux or SuSE distributions and 170Mb of user space, for up to 14 days. There are fee-based offerings available as well. Visit <http://www.iseries.ibm.com/developer/factory/testdrive/> for details.