* The Web Design doc: https://docs.google.com/document/d/14Ym6LTR9hLBGI0cM0mMU_BDEKG3ysmRsakwzA5Z_Ce4/edit?hl=en_US&authkey=CLWU-ssM
* HN Contractors spreadsheet: https://spreadsheets.google.com/spreadsheet/ccc?key=0AlD_6iEb8Ed9dGs3clVJYi0yYVBka181Z0ZKRW9kQ0E&hl=en_US#gid=0
* HN Co-founder wishlist spreadsheet: https://spreadsheets1.google.com/spreadsheet/ccc?hl=en_US&key=t1_0CjyeF5QqMwgh6AFGtqA&hl=en_US#gid=9
* Startup Ideas spreadsheet (now read-only, was writable by all HN pretty sure): https://spreadsheets1.google.com/spreadsheet/ccc?hl=en_GB&key=tOGIddn3rPdqKbHWsqaWbiw&hl=en_GB#gid=2
* HN internships and interns: https://docs.google.com/Doc?docid=0ASrV38bNy1TlZHhqNjlmel8xMjdmN2Q4em5jZw&hl=en
* The SAAS Model Spreadsheet (not crowdsourced/writable, but was very popular): https://spreadsheets0.google.com/spreadsheet/ccc?authkey=CN_dm8wH&hl=en&key=tHPkF8Ow9ENfpgz7KpaxKeg&hl=en&authkey=CN_dm8wH#gid=0
* The complete list of TED talks by date (not crowdsourced/writable, but still very useful): https://spreadsheets.google.com/pub?key=pjGlYH-8AK8ffDa6o2bYlXg&gid=0
Context: In the thread about the crowdsourced Google+ Doc/book, I brought up the HN tradition of similarly impressive collaboration. Somebody asked for a list (http://news.ycombinator.com/item?id=2772095).
It'd be really cool if you add any I missed in the thread below.
[update: Yes, it does occur to me to put them all... in a spreadsheet. :D And yet I really wanted this to be skimmable without clicking out, etc. I'm not opposed to putting these (and any contributed below) in a spreadsheet later.]