Actually we deployed it on the second day of release.
We decided that the security improvements in IE 7 lowered the overall attack
vectors by a factor of 3 from IE 6.x. That in itself was enough
justification.
We had also had a lot of reports about web sites not working, and when we
checked systems found other browsers installed than the corporate mandated
IE (due to the level of Web apps in use), so we decided to go with IE 7,
lock down via GPO and deploy.
All SMS pushes for new software get a "rate this upgrade" HTTP page that
opens during/following the initial install.
Bill F.