Thanks for your input, I briefly checked those links and they seem to be stores and quite overwhelming in their range of products and tutorials. What I'm looking for is mostly project tutorials or books at a basic level, as in "how do I start?". For instance, the nerdkit had me build a temperature sensor from the most basic parts and display the temperature in a LCD (bundled with the kit).
Sorry, I should have been more specific. For AdaFruit, there are two (among many) options. A general "Learn" page (learn.adafruit.com) with all sorts of step-by-step projects using different microcontrollers. Most products pages will also have a list of projects and introductory pages (many with video). For example, the Raspberry Pi has this: www.adafruit.com/product/3055
Sparkfun has pretty much the same thing with a "learn" page (learn.sparkfun.com) and all sorts of tutorials. E.g. here's a list of tutorials/projects dealing with ATtiny variants, a microcontroller discussed in the original artical: https://learn.sparkfun.com/tutorials/tags/attiny
