An improved Beta of IronPython was recently released. There is a bunch of bugfixes, more and more C Python testcases are passing (list of passing tests) and this version was the first of Betas to be signed with a strong name.

More details on changes are here:  http://workspaces.gotdotnet.com/ironpython

You can download IronPython 1.0 Beta 7 from http://www.microsoft.com/downloads/details.aspx?FamilyId=5024FDAA-634B-4A8E-916D-FB2CD2B78821&displaylang=en

Happy coding!