I am using Lisp more, and big changes to my consulting business
I have three book projects that I am currently working on: "Practical Scheme Programming (Using Chez Scheme and Chicken Scheme)", "Ruby Programming Playbook", and a fourth edition update to "Loving Common Lisp, or the Savvy Programmer's Secret Weapon". All three of these books will be released using a Creative Commons no commercial reuse, no modifications, share with attribution license, so copies of these eBooks can be shared with your friends.
I have a long history using Common Lisp, starting when I upgraded my Xerox 1108 Lisp Machine in 1983. I have written two successful commercial products in Common Lisp, used a derivative of Common Lisp to program a Connection Machine, and used CL on several large projects.
To brush up on Common Lisp, I am (once again) working through several books written by people with far better Common Lisp programming skills than I have: Edi Weitz, Peter Norvig, and Paul Graham. My Common Lisp code sometimes suffers from using too small of a subset of Common Lisp and I don't always write idiomatic Common Lisp code. It is definitely time for me to brush up on my skills as I rewrite my old book.
I have only written one Ruby book (for Apress) in the past but since I use Ruby so much for small "getting stuff done" tasks, I have intended to finish a new book on Ruby that I started writing about two years ago.
I hope to have all three of these writing projects complete in the next 18 months. When I published my last book "Introduction to Cognitive Computing" last month, I counted my titles and realized that I have written 24 books in the last 29 years. I love every aspect of writing, and I have met many awesome people because I am an author, so the effort is very worthwhile.
re: large changes to my consulting business:
I have combined doing remote and onsite consulting for the last 18 years. I used to very much enjoy both remote and onsite work but in the last few years I have found that I don't enjoy working remotely as much as I used to while I have been very much enjoying my onsite gigs where I get to meet my customers and not just talk on the phone. Working onsite is a very different experience. So, I have stopped accepting remote work except for longer term projects with some onsite "face time" with customers.