Ran Geva has created CustomizeGoogle for Internet Explorer, an open source project based on the extension for Firefox. Some of the features from the
CustomzieGoogle Firefox extension are available, but not all. Ad blocking, for instance, is not available. Also, Ran Geva, is using his extension to promote his own search engine.

But aside from that, CustomizeGoogle for IE seems to be working great. If you are using Internet Explorer (why, why, why?), you should really try this extension!
CustomizeGoogle for IE can be downloaded
here. The current version 0.1 is only available for Windows in english. The source code is included in the install.