I discovered the seemingly unknown, but quite remarkably knowledgeable and talented jazz pianist and teacher Dave Frank by accident recently. It did not take me long before I ordered both of his Joy of Improv books which I really like the look of as they are set out in graded curriculum style using 26 lessons. Each lesson contains a technical exercise, hip jazz voicings, a solo pattern for transposition, an original blues tune and a jazz line based on a standard. Dave has also done a great series of video lessons and the one I have watched took apart Bill Evans playing and technique using the tune "A Time For Love". About the best explanation I have come across to date of how these great jazz players but together their real-time compositions. Here is the first in the series of 8 videos Dave has put together for this lesson alone. Enjoy!
I really like the Pianist magazine which I have posted about here. Yesterday, I did a little google search for other keyboard/piano magazines and discovered Clavier Companion which I think has only been in existence for a little while as there are only 9 issues dating back to 2010. It is perhaps aimed at the more experienced pianist being a little more erudite than Pianist with some great in depth analysis articles. Like Pianist it is published every 2 months and they also offer an iPad app. Although, their website offers a digital edition to subscribe to it appears that if you use the iPad app you can download the issues for free as I have done just that. with 8 of them. Do check it out as I think you will find it is well worth it.