I'm just dipping my toes into the buy-to-let waters, and have been soaking up information like a sponge from any and everywhere. Without a doubt, this is the best source I've come across, providing clear, sound and realistic advice. Written in a gently humerous and unpatronising style, if offers both breadth and plenty detail, including very useful chapters on how to manage without letting agents, and getting to grips with tax.
It's much more current than certain other publications, for example it doesn't trip itself up citing no-longer-attainable rental yields, or recommend specific (long out-of-date) investment areas.
In other words, its author is realistic about the fluctuating housing and rental market, with evident ample experience from which to offer clear, sensible guidance and advice about how to stay afloat in unpredictable and choppy seas.
Worth every penny.