I just want to second this recommendation. It's a very thorough collection, quite stable, and helpfully has IE Developer Toolbar preinstalled on IE5 and up.
Utilo greyed out IE 7 and 8 for me, and installed a crashing IE6 on Windows 7 32 bit. I have IE9 installed, so that may be been the prob.
Same thing happened on Windows Vista 32bit with IE8 Installed...
Really great. Specially since as of now, Feb 21 2011, the spoon downloads on this article were taken out (it happend 7 days ago).