There's not a huge amount wrong with the web core (HTML engine) that drives Internet Explorer. That's also going to be improved with the official release of Internet Explorer 7, at the end of October. However, it's Internet Explorer itself that's a problem. It's not been updated properly for years, lacks some of the basic features found within Firefox 2.0 or Opera 9 and to many people, it is a security hazard.
What many people do not realise is that there are many IE-based alternative web browsers that use the same IE web core, but wrap this around a different and much-improved interface. For instance, Avant is now up to revision 11, and is updated weekly, whilst Maxthon is another popular IE-based web browser. Both support all the modern features you'd expect, including tabbed browsing. Deepnet Explorer is another worth a look.
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