AJAX and IE7?

"Many of the AJAX libraries out there have tons of duplicate functionality to handle cross-browser support. Recalling Microsoft's history of IE quirks, it seems likely that the new IE7 will have its own set of problems with regards to JS implementation. With the AJAX craze only growing, how are other developers and IT departments addressing this problem? Is this even a valid concern? While this is probably not an issue with ASP developers - especially with the release of Atlas - is this an issue for sites that use non-MS technologies?" Source: slashdot.org