Aryeh Kaplan’s Jewish Meditation has become, over the years, a kind of source book for Jewish meditation. Re-reading it, I can see why. Kaplan starts off with a soft approach, and then gets into some good, basic Jewish meditative techniques, ending with more advanced visualizations and work with Jewish letter mysticism.
Even with the proliferation of books on Jewish meditation in the nearly thirty years after its publication, Jewish Meditation is still a gem. Basic, steady and extremely Jewish in its content and approach, it still is an excellent source for beginners seeking out Jewish forms of meditative activity.