I don't know of a Master List of Widgets but I can tell you another widget I use often is Polls and Surveys from PollDaddy.com. These get your viewers involved, thus making your site quite "sticky" and you can find out some interesting things about who's on your site by just wording a question right. I post my polls for about a month and then present the information "which you get at PollDaddy" to the powers that pay for the site. They're always impressed and can't get enough.
The Pixel Dog @ PixelSwirl.com
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