Found this on the official IEBlog - long story short, your ability to uninstall your current version of Internet Explorer is entirely dependent on what version you have going into SP3.  So…

IE6: No problem.  You couldn’t uninstall this even if you wanted to.  SP3 will give you all of the latest patches and security updates.

IE7: Though you can uninstall IE7 now, you will not be able to uninstall IE7 once you get SP3 on your system unless you install IE7 after you install SP3.

IE8 Beta: Though you can uninstall IE8 now, you will not be able to uninstall IE8 once you get SP3 on your system unless you install IE8 after you install SP3.

What this means is that, if you ever want to get rid of IE7 or IE8 from your machine after you install SP3, your best bet is to uninstall them immediately before applying the service pack, installing the service pack, then reinstalling your preferred version of Internet Explorer.

To be honest, this isn’t going to be a big deal for most users, but it’s still good to be aware of.  If you like your current version of Internet Explorer, don’t worry about it.  Simple as that.

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