Erlang, the movie (and the language)
A co-worker heard about my experience with functional programming (everything apart from the database (which is Oracle) on my.ITU is written in Standard ML, which makes it a pretty large system written entirely in a functional language. But that's another story), and suggested that I looking into Erlang a bit, because we had a potential client in need for these skills.
So I did. I got a copy of Programming in Erlang, bought an online course and digged into it. The language Erlang language was designed by Ericson and used for the AXD301 telephone switch. This product is reported to achieve a high availability of nine "9"s. Why is that impressive? Well, seven 9s (99.99999%) guarantees you just 3 seconds of downtime per year. Nine nines gives you a maximum of 30 milliseconds of downtime per year! To achieve this, Erlang supports hot swapping, where code can be changed without stopping the system. Pretty cool.
The cool guys at Ericson even made a small film called "Erlang, the movie," way before Youtube was mainstream. Do yourself a favor and watch it. It both shows features of the awesome language and is also quite nerdy and funny.