Well, that's an interesing topic, I'd say. Not sure this counts as "technique" but here goes.
I play mostly vintage rock stuff, but also some jazz tunes like "Quiet Nights" and "Goodbye Pork Pie Hat". I have found that I can play easier (and better) with lighter strings, so I have extra lights on my Guild, and also on my PRS. I am a flatpicker, so I also have been using a "beveled" pick - Dunlop Flow .73 - which helps me play more fluidly. So I guess I'm saying I have set the guitars up and their "accessories" to increase my ability to play as well as I can. Then the rest is up to me!
I have been taking video lessons from Paul Gilbert (ArtistWorks.com) and my vibrato technique has gotten much better. I just did a lesson with him for "I Want You (She's So Heavy)" (speaking of Abbey Road!) that has a lot of vibrato, and it is a blast! If you don't know that song, Lennon is playing guitar to mimic his singing - actually a very jazz guitar-ish technique (think George Benson!).
I'm not sure I'm getting any "better", although I might be. But I am learning to do some things better that I didn't know how to do very well before. Technique-wise, I could still improve on my timing, and my use of dynamics while playing.
walrus