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The Google buttons do use the ARIA role="button" attribute, which should let them work in screen readers.

Good point on accessibility. Anyone have links to making your UI accessible (including buttons)?

Here's a pretty good introduction on ARIA which is what Google uses to make their web sites accessible: http://msdn.microsoft.com/en-us/scriptjunkie/ff743762

Or for people using Vimperator/Pentadactyl :|