Just saw this on CGtalk today. If you enter their new contest (not DW III) you can get a free non-commercial license of XSI6.5 Essentials that will expire one week after the contest ends. If you complete your entry though you'll be able to remove the expiration and use it as long as you want. It's not watermarked and doesn't seem to have any limitations, exporting works fine and you can add plugins/scripts. So if any of you are curious about XSI this seems like an easy way to try it out.
Cgtalk pageXSI page
rube
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This is really cool of Softimage. And it gives me a chance to finally upgrade.
Just a note, the rules say you must enter the challenge before getting your license.