A friend turned me on to this great piece by guitarist and songwriter Bryan Baker called the Top 10 Ways to Improve Your Guitar Playing Now -- however I'm calling it the Top 10 Ways to Improve Everything Now.
I've been thinking about lot of these things lately but have never seen them articulated so well and with humor in one place. Though the piece is written with guitar players in mind, it is applicable to any instrument and I'd argue any discipline. Well done Bryan. It's a great and funny read, check it out.
Top 10 Ways to Improve Your Guitar Playing Now