What I mean is, how often do you look at other styles and incorporate stuff you like into your personal practice? I have a background in taekwondo from when I was a child, and I currently mostly train Goju Ryu. My longest training stint was in the Bujinkan through my teens into early 20's. I still remember most of the fundamental focus our club had (Kihon Happo and Five Elements) and I occassionally sneak things like Boshiken into my practice work. I also rather like John Chung's Taekwondo DVD's from Panther Productions, and theres some finer points on kicking and kicking combos that, given the karate-taekwondo link, I can bring into my karate rather seamlessly. Back when I was doing Judo, I attended seminars on Sambo with Vadim Kalganov, and some of the throw set ups and leg locks I remember to keep fresh in my personal practice. I think one or two techniques here or there stick with me from this, but I dont think its possible to truly learn a style like this, just borrow elements and bring ideas in.