For those that wish/need to block the Browser Choice from being presented (for example in large deployments with lockdown policies), there is now an article which describes how to prevent it from appearing (note it will still install the update, and the update cannot be uninstalled, but it will not launch BrowserChoice.exe for you).

http://support.microsoft.com/kb/2019411
Information about the Browser Choice update for system administrators who are in managed environments that are under a Volume Licensing program