If there any upgrade pathes between the plans? Let say that I buy the starter plan, like the content and want to buy the plan with the videos. Should I pay the full price?

Yes, you'll be able to upgrade. So the rational decision would be buying the cheapest plan and upgrading later. I just hope you're not rational… :)

Unfortunately I am :-) Thank you for the reply. Actually you should not fear rational people: if your content is good enough they will upgrade!

I have only read the first two chapters (setup and Javascript an overview).

The content do not look bad (but I have not read node.js specific parts yet so I can't really tell). The bad part is that it would need some serious proof-reading... Some sentences are missing words or are hardly understandable and there are some mistakes in the code.

Reiterating the sentiment. Seems great so far, but there are some errors that could create confusion. The good news is the author left his email address, so I dare say he's well aware by now :)

Sure, you have other options to read Kindle books without a Kindle device:

* On the web or on your iPhone/iPad https://read.amazon.com/

* On Android: https://play.google.com/store/apps/details?id=com.amazon.kin...

Wow, thanks. I did not actually know that Kindle books could be read without actually owning a Kindle capable device. I'm buying this right now.

I like the Chrome reader; it lets you read offline. Also, for programming titles, I actually prefer using a second monitor: more screen than a device, plus ability to copy and paste code is nice.

Also on Mac and Windows desktops. The great thing about Kindle is that it's almost as ubiquitous as PDF. Almost.

Minus the fact that there are some DRM in the Kindle books which is rather anoying.

PDF is an open standard, the Kindle format is not.

Kindle DRM doesn't annoy me at all. I'm not annoyed by just the existence of some technology, I'm annoyed if this technology hurts my ability to do what I want to do. I do want to read books on iPad, iPhone, Mac, PC and Kindle. I'm able to. If I wanted to steal books I could have been annoyed, but I don't want to.

1984 demonstrated that your ability depends on the continued goodwill and competence of Amazon, who reserved for themselves the power to steal any of your Kindle store purchases.

That case was so ironic I thought you were referring to George Orwell there for a minute.

For those such as myself that didn't catch the reference, nor hear about this the first time around: "Amazon Erases Orwell Books From Kindle" [1].

[1]: http://www.nytimes.com/2009/07/18/technology/companies/18ama...

Luckily there are easy to use tools to remove Kindle DRM and treat the book as if it were something you bought.

I would say Tripadvisor. Check the culture paragraph here http://highscalability.com/blog/2011/6/27/tripadvisor-archit...