plsql.me is for you. I have worked with PL/SQL for over 10 years, including supporting Pl/Sql at Oracle. So this site is for you to benefit from that experience. Working at Oracle were lots of less than optimal usage of Oracle and Pl/Sql. I found lots of way to solve these problems. So too there were those cutting edge users that pushed me to learn even more.
It is my hope that I can share with you some tips. And in turn get pushed by you to help you solve real world situations.