[all variants] Secure USB stick recommondations?

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http://ubuntuforums.org – Hi there, I am looking for a secure USB stick, which allows me to securely transport from Linux/Ubuntu/SUSE to Windows XP/Vista or MacOS X platforms and visa versa. Typically my situation when I should give a talk, getting to the presentation laptop, plugin my USB stick and start the presentation without any hassles. So, up to my knowledge TrueCrypt and other software in that field are not suitable for my situation, due to the fact that they need admin passwords, or even TrueCrypt installed on the particular platform. This is normally out of scope in these situations. So, I tried to google for a secure USB stick fitting my needs and found at best a review in Computerworld: www.computerworld.com/s/article/print/9062527/Review_7_secure_USB_drives However, the article is now older than year, so I would like to ask, if someone wants to share his/her "every day experiences" on Linux/Ubuntu especially with: The Imation Pivot Plus Flash Drive The IronKey Secure Flash Drive or any other secure USB stick? I suppose that MacOS X and Windows XP/Vista compatibility are not a problem. Thanks in advance, tp42 (Hardware)