Salsa
The Dancing Irishman on Youtube: A work in progress but I hope to make plenty of instructional videos to supplement the blog.
Addicted2Salsa: Anthony Persaud has done a fantastic job making very well explained salsa instructional videos. A huge amount of the combinations I use come from this site.
Languages
AllJapaneseAllgTheTime: I used this site almost as a bible for studying Japanese and the methods and motivational posts have had a huge affect on how I approach learning.
Fluent in 3 Months: Benny the Irish Polyglot is a guy who makes me proud to be Irish. A polyglot who proves you don’t need to be a child to learn multiple languages to fluency. He has some great tips for language learning on his blog.
Anki: a fantastic SRS (spaced repetition system) tool for learning languages (and much more)
Diet & Fitness
LeanGains: An fantastically effective intermittent fasting system based on real science and experience based data.
Bill Starr 5X5: This is an excellent explanation of the Bill Starr 5X5 weight training program which is a great program for beginner to intermediate lifters.
Miscellaneous
Trainless: At it’s heart it’s a website for the “alternative” traveler but in reality it offers a whole lot more and then some.
The Dancing Irishman 
Bill Starr was my brother’s college mentor. I have a painting of his hanging in my kitchen.
No freeking way. Small world eh (not that I ever met the man myself). How’s all with you Bernstein?