Or Shin Shin Toitsu Aikido is a "modern martial art" that has evolved from the traditional aikido.
Since aikido itself is sufficiantly covered, I will limit this text to the specifics of the Ki in ki-aikido.
In ki-aikido, the focus is put at the development of one's Ki -- sometimes freely translated to "life energy" -- by developing both body, mind and the cooperation between the two. When this cooperation, or unification, is achieved; a balans is obtained that results in effectiveness and harmony as of work, family life, sports and self defense.