Is there a good IE-based Selenium IDE?

The SeleniumIDE project is based on Firefox (and its plugin architecture). My application (for a variety of reasons) only runs on Internet Explorer (6+). In fact, we actively check for non-IE browsers and do an immediate redirect.

This is a 6 yr old codebase and we're trying to remove all of the html idiosyncrasies that necessitate our IE dependence.

We've already got a robust and growing set of NUNIT tests for code. We would like to add Selenium to do Web functional testing. Is there a good IDE for building/recording Selenium tests using IE as the browser?