Hi Monkey,
If you read the above comment about mindfullness being around "for a decade or two at a stretch" you will see it referred strictly to mindfullness "as practiced in popular therapy today". Mindfullness -as practiced or advocated by many psychotherapists today- has important conceptual differences to the older religious models of mindfullness (in terms of methods, language, and goals), even though the two overlap to some extent. The differences are significant and important, though I'm not interested in dissecting them here. In short, modern and ancient are not one and the same thing.
Jungians definately practice minfullness in relation to imaginal contents of the psyche- they prescribe watchfulness and awareness of these contents. In fact such mindfullness can be considered the modus operandi of the Jungian therapist and the jungian method, and Jung himself devoted much of his written corpus to this method which he named "active imagination" (Jung says active imagination is all about cultivating a critical awareness and control in relation to imagination). I'll have to politely disagree with your curious assumption about Jungian method as "a rather dangerous method that takes you quite forcefully to the depths of your unconscious in order to bring out powerful forces that remained stale in you for many years". Perhaps that was your experience. This is nothing remotely close to anything I have ever heard recommended or written by qualified Jungian therapists, most of whom are outwardly cautious about "forcing" anyone to go to any dark depths.
"Jung had no idea what BD was as this diagnosis didn't exist at the time when Jung was alive just like many other dxs from DSM"
Of course BD was named recently, but Jung was very aware of manic-depression when he wrote his long published paper on the subject in 1903, where he gave five long case stories which recognise literally all of the features we today list in the DSM-IV diagnostic criteria for BD. In fact Jung's 1903 paper recognised and advocated for the very first time in history a division between manic-depression involving psychosis, and manic-depression without psychosis- he was the first to push for this diagnostic distintion to be made between these two forms of the disorder.... it only took the DSM 90 more years to pick up on Jungs suggestion! So I think its a bit unreasonable to say that jung had no idea what BD was- he may not have heard that label but he was very aware of the condition and associated behaviours, just calling it by another name. And those post-Jung Jungians do indeed base thier approaches to BD largely on Jung's early and later conceptualisations of this condition, and on his view of the psyche generally. What's more is that the Jungian conceptualization offers a fascinatingly different approach to those currently enjoying popularity in the mainstream- not that I would tear down any approach.... there is something out there for everyone.