Their intention is for the pool to act as a filter to clean NYC's waterways[1]. Research into effective water filters could be worthwhile, but the floating pool seems to overshadow that aspect.
Throwing in a mention for PodKicker[1], since you mentioned searching/discovery. The UI needs a lot of work, but it is nice to have the search engine built-in (they claim an index of 250,000), instead of trying to grab RSS links from a podcast's homepage. The search itself is even available as a separate app[2].
Looks like the last time it traded below $500 was November 17th[1] - so everyone you know who is interested has only become interested in the past two weeks?
It displayed as the default "Microsoft Word" layout when I first viewed it (after enabling Javascript), but then, when I used the "back" keyboard shortcut to try and come back here, the page re-displayed in a lightbox. Fun.
To be fair, the dig was on the tech press not focusing on Seattle and being Silicon Valley-focused, not on a lack of tech in Seattle, which is certainly not true :)
[1]: http://www.pluspool.org/about/