I think it is very important to learn a few different technologies from time to time - they often expose you to various concepts you haven't heard of before. My

I think it is very important to learn a few different technologies from time to time - they often expose you to various concepts you haven't heard of before. My personal experience with Rails (reading the source code itself and that of its plugins) was that I got so many ideas how to do stuff that transfered quite well to my other projects. It happens so often that after I switch technologies, and then return after awhile I have a "wow it is so much easier to do it this new way" feel. Creative thinking is fundamentally a "combine and use old stuff in a new way", which means that learning new technologies is worth it just because of the new ideas, and if you can later use those technologies themselves - well thats just a bonus. Anyway, the original comment is right on the money. I often have to tell miself "just write the damn stuff and refine it later" when I get mentally stuck thinking about ways in which it could break.