Is IE8 much superior to IE7?
Should I d/l it?
I have a HP with Vistas Home Premium, 64 bit, PC.

Is IE8 much superior to IE7?

I don't think so. IE8 Features (http://www.microsoft.com/windows/internet-explorer/features/faster.aspx) covers some of the new features. Not all sites are IE8 compatible yet. IE7's paltry favorite management forced my switch to Firefox and IE8 offered nothing to motivate a switch back to IE.