I really like this feature of Opera's.
Here's the only way I've found to replicate it for Internet Explorer:
1. Use StrokeIt to map gesture LBUTTON_UP (combined with right button) to Alt+Left, the "Back" keystroke
2. Use UltraMouse to map Left Click + Right Click to "Browser: Forward"
This works great, though UltraMouse is not free.
Why do I need to use both apps?
StrokeIt is unable to support the left+right click trigger.
UltraMouse doesn't hide the right-click from IE, making the Right Click + Left Click sequence also pop up the context menu!
Ah well - any better suggestions are welcome!
Cheers,
rschm_at_broadpark_dot_no