Online regex tester and debugger: JavaScript, Python, PHP, and PCRE
Really powerful tool for testing complex regular expressions against sample text.
#howto
Git Immersion
Git Immersion is a guided tour that walks through the fundamentals of git, inspired by the premise that to know a thing is to do it.
Learn Python The Hard Way
One day I’ll get around to this.
Mobile-friendly
Opera’s guide to mobile device optimization
Terminal Tricks for Mac
Big collection of Terminal tips, tricks etc for Mac OSX.
Implementing PubSubHubbub subscriber support: A step-by-step guide
Implementing PubSubHubbub subscriber support: A step-by-step guide
A nice step-by step (with some gotchas) tutorial on PuSH-enabling a feed client.
Indonesian in 7 days
Really well-made site with the basics of Indonesian Bahasa, including audio for pronunciation.
How to use Facebook with a feed reader
How to use Facebook with a feed reader
URL tricks to get at RSS feeds from various parts of Facebook
Stupid WordPress Tricks
Huge list of WordPress tips, with code samples where appropriate.