Some time ago, DZone has introduced an interesting feature – DZone Refcardz. This is a collection of cheat sheets (111 items by now) on different topics, e.g. programming languages, developer tools and IDEs, development approaches and trends.
Cheat sheets will never replace books, full time trainings or tutorials – they are meant to be short and brief; supply the reader with the basics and summary; simple enough. You won’t learn the subject in details but DZone refcardz are worth giving a try.
I can see several usage models: (i) get a general meaning on a subject new to me (if I like it, then I go for it in details), (ii) refresh something, (iii) get back to it when in need of checking something quickly.
DZone Refcardz homepage: http://refcardz.dzone.com