You’re welcome! The book I was thinking of is Eye to the Infinite by R’ Aharon Rubin. I haven’t read it but it get good reviews (including the chassidim blogging at Mystical Paths). There are many other books on meditation written by frum Jews. R’ Aryeh Kaplan’s book on Jewish meditation is definitely worth reading. R’ Dovber Pinson has also written books on Jewish meditation.
When people think of meditation, they think of sitting there silently or repeating a phrase or something, but that’s only one of many different ways of Jewish meditation. Ideally, davening should be a form of meditation. Personal prayer, hisbodedus, is also an important form of meditation (in fact, in Likutei Eitzos hisbodedus is often translated as meditation). Brachos should also be meditations, making us aware of G-d’s greatness and kindness and the fact that everything we have comes from Him. Many people have written about these topics.
Tehillim, too, is a great form of meditation — it’s not just for praying for people who are ill or whatever. It is good to say a few chapters of tehillim a day, applying the words to your own life (references to evil people and battles and such can be understood as referring to your own evil inclination or negative character traits and struggles in life). I prefer the interlinear Tehillim myself, even for praying in English — the translation’s not bad, and it slows you down so you have better kavanah.
Meditation is neglected by many nowadays but it is important for many reasons. We are supposed to love Hashem, and serve him with every fiber of our beings, all parts of our mind and heart. How can we do this if our davening and learning is only in our heads? To really achieve simcha, emuna, bitachon, kavanah, some form of meditation is necessary.