A free, independent, and open source set of curricula for learning languages.
Purchase equipment for lockpicking, lock hacking, and locksmithing here. Excellent prices, excellent equipment.
David MacKay has put the textbook he wrote online for everyone to download in a variety of formats. If you find it useful, consider buying a copy.
Higher Intellect is a World Wide Web server hosting a searchable database of over 750,000 text files on a variety of subjects. We also host a server running on the Hotline and KDX protocols featuring a vast collection of antique software, obscure operating systems, and open source software. To connect, simply download a copy of Hotline/KDX and connect to kdx.preterhuman.net
A grassroots peer-based education project based around online learning and remote collaboration between small groups of students. They just started up so things are a little thin at the moment. This is an interesting experiment to keep your eye on. Creative Commons.
A site that has presents a step-by-step howto for getting involved with OpenStreetmap.
A blog entry which catalogs free as in beer foreign language lessons, usually in the form of podcasts.