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POPSMozilla Firefox Addon- iMacro Script Sharing Script sharing programs like this Firefox addon allow users to share processes rather than content alone. The added value of "teaching a man to fish" makes this an educational as well as an efficiency-increasing medium. Users sharing macros may also experience more similar search results if their personalization settings are enabled, making it easier for people to evaluate the results of a downloaded macro.
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POPSWik.is - free wiki hosting + google integration I'm checking out free wiki hosting services, and will definitely have to give this one a look. I love mediawiki and would just host that myself, but I've seen far too many wikis crumble in the face of massive spam attacks. A hosted solution means someone else is working on the spam problem as well.
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POPSTangler features Comprehensive feature set judging by the bulletins for Particls (www.particls.com).
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POPSDiigo's WebSlides is live: embed a feed as an in-page Flash slideshow Not 100% functional yet (you have to supply a feed rather than a list of sites, which is supposedly coming), but it seems very cool and potentially very useful. Give it a feed URL and it will generate a clickable, interactive, live slideshow of all the pages in the feed, which can be annotated by anyone (not just Diigo members) with no downloads.