A reader wrote in with this link.  Some folks who downloaded IE 7.0 through WSUS last night got a Spanish version rather than then English version.  Microsoft is aware of the issue and is working on correcting it.  Apparently the Spanish version of IE 7.0 accidently got classified as the English version.

Update 1

Microsoft has fixed the issue with the WSUS package.  From a posting to one of Microsoft's public newsgroups:

To immediately address the spread of this issue, the IE7.0 update package has been expired effective 5:00PM PST, Wednesday, 11/22/06.  Synchronizing WSUS servers after 5:00PM PST will ensure the expiration status is applied to the latest IE7.0 update rollup package, released 11/21/06.

For more details, see the blog entry.