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Webwag is another single page aggregation service. Is it worth using? Yes, but maybe not instead of some of the big guys.
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YourMinis is a nice service that puts two current Web 2.0 themes together: Widgets and Aggregators.
Start-ups from Stirr: 30 Boxes, ClickFacts, DevjaVu, ZapTix, SpyMedia, and NetVibes