I assume you mean recent and active projects; there's nothing recent I can remember that attempts to do the kind of thing I tried to describe in the second paragraph of my comment. (Which is why I intend to start working on my own modest, desperate attempt at it in the following months.)
However, there are various projects, some of them historical, that have attempted to tackle it in limited contexts, or implemented parts of it, or have envisioned it in holistic systems that are now outdated. Almost all of the somewhat interesting ones I've come across can unfortunately be classified as one of the following: 1) Productized, narrowly focused yet-another-app 2) Academic or overly specialized in-house or personal project with no real effort at widespread usability 3) Unmaintained and outdated 4) Essentially vaporware
With that said, here are a few links of interest, with the forefathers noted first:
I'm in the preliminary research phase, and it's too early to tell. But I'm investigating the feasibility of using the Open Annotation data model (draft: http://openannotation.org/spec/core/), which they are also basing their work on, so the possibility is open.
Thanks for the link; I've been out of touch with his writing for some time. It's good to be reminded.
As for help, I'm going to need much of it once things materialize. It's going to be free (as in freedom) software, and contributions will be essential; but I don't intend to release anything until the initial architecture is settled and I have a working, dogfoodable version 0.1. And if I fail to create the necessary living conditions for focusing on the project, that can take a while.
I hope you don't mind me contacting you when that celebrated time comes. And if anyone is interested in updates or would like to discuss related matters, feel free to say hello at the email at the address in my profile. (Some folks already have; thank you.)
However, there are various projects, some of them historical, that have attempted to tackle it in limited contexts, or implemented parts of it, or have envisioned it in holistic systems that are now outdated. Almost all of the somewhat interesting ones I've come across can unfortunately be classified as one of the following: 1) Productized, narrowly focused yet-another-app 2) Academic or overly specialized in-house or personal project with no real effort at widespread usability 3) Unmaintained and outdated 4) Essentially vaporware
With that said, here are a few links of interest, with the forefathers noted first:
* Xanadu: http://en.wikipedia.org/wiki/Project_Xanadu
* NLS: https://en.wikipedia.org/wiki/NLS_%28computer_system%29
* Relations: http://relations-rcp.sourceforge.net/
* Zettelkasten: http://zettelkasten.danielluedecke.de/en/index.php
* semantic-notes: https://github.com/jsomers/semantic-notes
* Synapsen: http://www.verzetteln.de/synapsen/shots_e.html
* flashbake: https://github.com/commandline/flashbake
* ConnectedText: http://www.connectedtext.com/
* The Literary Machine: http://sommestad.com/lm.htm
* Leo: http://webpages.charter.net/edreamleo/front.html
* Smart Notebooks (currently seeking funding on Kickstarter): http://www.kickstarter.com/projects/1947703258/smart-noteboo...
* Bibkosh: http://www.bibkosh.com
* gitmarks: https://github.com/hmason/gitmarks
* Lifestreams: http://cs-www.cs.yale.edu/homes/freeman/lifestreams.html , http://www.wired.com/wired/archive/5.02/fflifestreams.html
* Locker: https://github.com/quartzjer/Locker
* Telehash: http://telehash.org/
* Singly: https://www.singly.com/
* pan.do/ra: https://pan.do/ra#about
* Papers: http://www.mekentosj.com/papers/
Some related reading:
* http://www.rheingold.com/texts/tft/1.html
* http://takingnotenow.blogspot.co.uk/
* http://www.visi.com/~snowfall/notebook.html
* http://web.archive.org/web/20100422130439/http://gilest.org/...
* http://web.archive.org/web/20100108034547/http://software-li...
* http://en.wikipedia.org/wiki/Commonplace_book
* http://www.xanadu.com.au/ted/XUsurvey/xuDation.html
* http://chronicle.com/blogs/profhacker/reading-with-the-stars...
* http://www.openannotation.org/
* http://www.katsommers.com/2010/11/02/web-narrative/
* http://www.paleofuture.com/blog/tag/dymaxion-chronofile
* http://www.jagshouse.com/swyft.html
* http://al3x.net/2009/01/31/against-everything-buckets.html