That was until I came across Greasemonkey for IE, a Internet Explorer add-on which will allow you to bring the original functionality of Greasemonkey to Internet Explorer.
Greasemonkey for IE is an Internet Explorer extension which lets you to add bits of DHTML (“user scripts”) to any web page to change its behavior. In much the same way that user CSS lets you take control of a web page’s style, user scripts let you easily control any aspect of a web page’s design or interaction.
There are only a limited amount of user scripts available right now, but it would be great if there was compatibility between the Firefox Greasemonkey scripts and Internet Explorer Greasemonkey scripts.
This is definitely a great add-on to have for Internet Explorer and with the usefulness of Greasemonkey I bet there will be quite a few takers for this. Just to add that the popular add-on IE7 Pro for Internet Explorer also allows you to run user scripts just like Greasemonkey.