In support of lots of conversations I have with people about interesting places on the "the Net", here is a starter list as discussed at lunch today ...
Wikipedia, www.wikipedia.com ... online collaborative encyclopedia
MediaWiki, www.mediawiki.org/wiki/MediaWiki ... a way for you to make your own Wiki site, e.g. collaborative development of documentation for any type of project.
Newsgator, www.newsgator.com ... RSS Aggregator for Outlook and web access. My hunch this company will be bought by Microsoft within a year or so.
Technorati, www.technorati.com ... to find blogs. Other way to find blogs is via search engine (Google) or by looking at blogger's lists (see mine below right ... although out of date, I see).
iTunes, www.apple.com ... to subscribe and listen to Podcasts (iPod not needed)
Blogger, www.blogger.com ... Blog software provided by Google to individuals to publish blogs.
Writely, www.writely.com ... online word processor and collaboration tool.
Six Apart, www.sixapart.com/ ... publishers of Movable Type, a publishing platform which would probably be the one to implement for use by large organsations and institutions.
Sharepoint, www.microsoft.com/sharepoint ... Microsoft's collaboration software platform which per recent discussion by Microsoft will only get more ubquitious. Can't help but think this will be a bigger part of Office 12.
phpCollab, http://sourceforge.net/projects/phpcollab ... Project management and collaboration over the internet. Features team/client sites, task assignment, document repository/workflow, gantt charts, discussions, calendar, notifications, support requests, weblog newsdesk, invoicing, and many other tools. Open source licensed under GPL.
OpenOffice, www.openoffice.org ... the "free" replacement of Microsoft Office.
SpamAssassin, www.spamassassin.org ... because it works.