As I mentioned previously, I've spent some time learning non-MS oriented technology since moving across the lake from Redmond to Seattle (where Amazon is located).
The initial two technologies I've focused on are PHP and Perl. I'm impressed with Perl's text processing capabilities, large number of libraries available, and easy networking (especially HTTP). I've noticed that writing Perl is more fun that trying to understand someone else's Perl code. There seems to be an endless number of ways to do things in perl, even a condition, making it difficult to understand someone else's code. Still, I can see myself using perl for some of my projects.
I really liked PHP. It is clean and I felt productive. The newest release of PHP (v5.0) provides functionality so that developers can better structure their code.
I also started to notice some buzz about Ruby and Ruby on Rails (RoR) over the last few months. Some hipster sites like www.43things.com and basecamphq.com were developed using Rails. I first stumbled upon this when Dave Thomas, the author of Programming Ruby, visiting Amazon and gave a talk about the newest edition of his book. Since I work on the same floor as where these book author visits occur I noticed how many developer looking folks from around Amazon were hanging out and became curious. Unfortunately, I arrived at the even too late to receive a free copy of his book.
I spoke to some of the devs on my team about Ruby, then forgot about it. After all, I didn't have time to learn this new nascent language when I had to catch up and learn PHP and Perl.