I do write some scripts in R but not really serious programming. As I am interested in advanced use of R, I will be in the following course organized by Wolfgang Huber.
http://www-huber.embl.de/courses/2013-advR/
The course seems to match with my stage, as it explains
This course is designed for users who have experience with writing R scripts, and who now want to advance one step further, into producing more durable and robust software projects and code that is usable by others.
As I always have had a plan to migrate FRAPcalc program from IgorPro to R and also add some more functionalities, this course should be the one I should attend… I thank Wolfgang for his initiative in making this course available. Besides, I am happy to see another EMBL centre being active!