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Using IE5 (I'm a Google Toolbar addict), I find that the sites work OK with their CSS. Is there a type of CSS that you've found problems with?
Besides, I think that they should think twice before they make this "alpha". Caching documents is one thing, and you can at least disallow it. But showing modified pages while claiming you show a preview of the original is clear copyright infringement imho. If they filter out all the "break out of other peoples frames"-javascripts, for example, it is surely against the intention of the designer/webmmaster who put them there exactly to disallow something like google viewer.