Good choice, Bateman 
For me, your posts are the most interesting ones :-). My favourite one is your initial Memory Palace wiki page - picking places like walls and corners is a fast way to get more loci when I am missing some. And before reading that page I firmly believed that reusing palaces for long term memorization is not possible. Another good way to get more loci is using Video Game Memory Palaces, my favourite was the “jumping closet” video - these interactive objects make really good loci, because it’s just impossible to forget them.
New Getting Started Guide is much more newbie-friendly than the previous one. I liked the idea of using Mnemonic Clock as daily calendar and as a tool to perceive the passing of time. And Emotional Memory Palace is a completely new type of palace - a palace where you enter to make you feel better and give you strength (or the opposite), or a tool to make you be convinced/believer in something. Thank you, Bateman, for these wonderful posts!
Now, if to continue with palaces eliciting emotions, then the most surprising post in this forum was top’s Really scared when meeting myself in my palace. I guess one really can freak himself out, if he/she has very vivid visualization.
Nerto’s Inverted Memory Palace changed my view of memory palaces: instead of deducing locus → item that you placed there, you deduce item → the locus where it was placed. And there is a tutorial that uses this technique for memorizing long numbers.
Now some interesting posts in Psychology and Health category: Using your hands to improve creativeness/working memory and Walking is good for creativity can be helpful, if you’re stuck somewhere and need some creativity boost. What is you strategy for fitness and nutrition? reveals some really strict diets of different mnemonists.
That’s all that I can think of now.