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The one that caught my eye is Tweak UI. It gives you several new options for IE6, including these:
* Autocorrect backslashes (so "\" becomes "/" in a URL)
* Add a custom background for the toolbar!
* Use a specific search engine for searches
* Change the animation used for the throbbers
* Adjust the size of the image toolbar
There are also settings for Windows that control things like the mouse, keyboard and folders. It's well worth a look.