Bookmarks (General)
50 Inspiring TED Talks - we love TED! Especially when my stress level is high and the kiddo's constant chatter drives the irritation level up a couple more notches LOL. Seriously though, we love the 20-minute odd talks because they offer a lot of food for thought.
Potted Learning Pages - you will honestly be floored by the choices!
Summer Institute for the Gifted - resources for teachers, parents and students. The student pages feature some pretty neat options.
Thinkquest - a library of projects and resources by students for students
Bookmarks (High School/AP/College)
Academic Earth - features online courses from some of the best unis on Earth.
Brightstorm - great video-based math and science courses for the older student.
Brown's PreCollege Courses - not free or cheap but very tempting!
HippoCampus - free, interactive online textbooks.
MIT Open Courseware - love this site for its myriad offerings and also the following:
Open Yale Courses
Self Made Scholar - links to other free online learning sites
UC Berkeley Webcasts
Bookmarks (K-12/Gifted)
CTD Northwestern's GLL - Gifted Learning Links offers creatively-designed online learning courses for gifted students. Again, not cheap. But if you have the means, it could be fun to try something different now and then. Others in a similar category:
Duke TIP
EPGY Online High School
Gifted Kids Network
Johns Hopkins CTY
Online G3
SAS Curriculum Pathways
Bookmarks (Others)
And if the above aren't enough, here's more:
Landry Academy
List of Online Classes from the Walls of Books blog
e-Learning