Yes, ruby on rails. Learning to start on a webapp project I have in mind. The reason I want to learn ruby on rails as oppose to PHP or Phython is because my friend/partner is more comfortable using ruby on rails. Therefore, in order to collaborate with him, I should learn ruby on rails. Having said all that, I would still like to hear your opinion on what language I should start on.. if you have one. Thanks.

Learning Ruby on Rails will give you a great understanding of how to build web applications, it will give you lots of tools that let you do so quickly, and it will introduce you to an elegant, powerful language that is a joy to use. But the best reason for you, personally, to learn RoR is that you have a friend and partner that would like to collaborate on something with you, and they are (hopefully!) willing to help you.