A new release of IE is always important because this is the browser that many millions of Windows users will be surfing the web with daily. Like it or not, by the very fact that IE is knitted into every Windows installation makes this an important event.
After what seemed like years of stagnation, Microsoft is continuing the tradition of kitting out IE8 with features that users of other browsers take for granted. That said, there are very nice features built into IE8, which include:
Smart Address Bar
Enhanced find
Tab groups
InPrivate
Crash recovery
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For XP x86 - Here
For Vista x86 - Here