Minor resources

Here's some websites and resources that I don't really "follow" or don't really qualify as a resource but they're cool, inspirational, and worth mentioning.

woodgears.ca - A woodworking site where Mathias Wandel publishes his projects and other things. Great projects and concepts.

vihart.com - Vi Hart is a college student who explores ideas in math and music. She makes very good and entertaining videos.

engineerguy.com - Bill Hammack has made amazing videos about science and engineering. He mainly does segments on radio about explaining technology. His videos have gotten many mentions and praises.

crazybuilders.com - An MIT college student who has his projects on his site. Lots of great ideas and explanations.

University of Nottingham: Brady Haran is a video journalist at the University of Nottingham in England. He has made videos about the things that various departments do. The best known is the Periodic Table of Videos, with a video for every element. Sixty Symbols is for physics (and some mathematics) and has (more than sixty) videos on various symbols and concepts.
periodicvideos.com
sixtysymbols.com

spectrum.ieee.org - IEEE Spectrum is IEEE's magazine, and their website has many good articles on electronics and technology. (They host the IEEE Automation blog on robotics.)

ladyada.net - Very good Arduino learning resource and store, their products are great for small and large products.

tesladownunder.com - This guy plays around with high voltage, tesla coils, and other high risk electronics.

waterloolabs.com - Waterloo Labs is a group of National Instruments engineers who have made sophisticated projects that are quite cool.

Lego and Mindstorms:

tinkernology.blogspot.com - Tinkernology is a Lego Technic blog, where the author posts his Lego and robotics findings and projects, among some other non-lego things.

sariel.pl - Sariel makes models out of Lego and incorporates brilliant building techniques and concepts. He makes a lot of cars and such that are powered in interesting ways.

mightor.wordpress.com - Xander makes mostly Mindstorms projects and includes a lot of electronics in them.

philohome.com - Philo is a Lego Mindstorms enthusiast that has some really ingenious projects.

nxtprograms.com - This site is devoted to giving Mindstorms project and all of them are amazingly designed and thought out.

Mathematics:

I use these to research math concepts.

wolframalpha.com - WolframAlpha is a mind blowing computational search engine from Wolfram Research. It will give you computational, factual answers to your questions (to a limit). Experience it for yourself, it's no cheezy scam. Here's a very good intro video.

mathworld.wolfram.com - A mathematics encyclopedia from Wolfram Research.

math.stackexchange.com - The mathematics stack exchange is a sort of forum or comment system to ask about math problems. Anyone learning any level of math is welcome, and there are many high-level topics discussed.