Every Good Book Deserves Favorable (review)
Pianolab presents a clearly written, well organized, pedagogically sound piano method for reasonably intellegent adult learners.
The author starts at the beginning giving instruction and guidance needed to progress through the increasingly complex exercises and pieces. The book is suitable for abject beginners as well as those with some musical knowledge and experience.
I won't make any great claims about my progress so far, but I'm having lots of fun playing piano. A bonus of having purchased a used copy is that seeing where my predecessor washed out makes me feel diligent, ,and talented.