What technology for what puprose & Famous examples

[elex]

Hello

I was looking for a good overview of what web technology is good for what purpose and famous example. I want to learn a new technology but I am not sure about which one. I looked into Ruby on Rails as a friend of mine told me it was great and a lot of fun. I already know PHP/mysql and .NET/Sharepoint.

Does anybody know a good overview?

I'd also be interested in what technologies the "big ones" use and why. Like Facebook (PHP I believe), Twitter (Ruby on Rails) and so on.

Looking forward to your feedback & opinions.

eLex

[eval(BadCode)]

pick up XML and XSLT if you haven't already. That's a big one, its also very handy and easy to learn.

Apple uses XML for iTunes (so I've head) to store song info.