Do I like IE 8 Beta 2 ?

Well my answer is "NO". I will get down to the points
1. Private mode is nothing great as a technology, firefox also provides a way in which you can delete on close. But yes this will not affect history but only the browsing session, so as such i dont consider it as a great "innovation".
2. Bloated, its memory footprint is high.
3. The so called "tab isolation" is crappy, i mean its nothing great, each tab is now an iexplore.exe process, so if you have 5 tabs you will have 6 iexplore.exe processes.
4. "tab isolation" has promised to make sure that even if a tab "hangs" others will work fine and the tab will be restored or killed without affecting other tabs, but i found myself in a situation where there were lot of hangs and everytime, the whole IE processes die together.
5. There were some sites where i found the website getting into an infinite loop, where it loads the same image(s) again and again and again ... which works perfectly fine with firefox.

I never liked safari too either, i would still rate firefox as the best and no doubt IE8 offers very little advantage over firefox. I know its beta 2 lets see how the final version looks like.