Maxthon is a free browser that works with the IE engine. It is highly customizable.

You can make it portable just by grabbing all the file in the installation folder.

Maxthon is a powerful web browser with a highly customizable interface. It is based on the Internet Explorer engine which means that what works in IE, works the same in Maxthon but with many additional efficient features like Tabbed Browsing Interface; Mouse Gestures; Super Drag&Drop; Privacy Protection; AD Hunter; Google Bar Support; External Utility Bar; and Skinning.

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• Maxthon 2.1.0.2082
• Maxthon 2.1.1.1619 Beta
• Maxthon 2.1.4.443
• Maxthon 2.1.1.1717
• I’m almost finished doing Vista unattended