A lot of scripts and even just plain HTML styled via css will probably have to be upgraded once IE 8 is officially released. But probably less than appears so now with IE 8 still in beta. MS is at least mildly committed to not breaking installed code.
In the meantime, you probably can take care of the problem at least temporarily by using the meta tag:
Code:
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7">
Place it in the head of your page with the other meta tags just before the title tag or just before the title tag if you currently have no other meta tags.
I would suggest you get non-beta browser like FF or Opera, which are both highly compliant without breaking too many previously developed scripts or pages.
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