It was actually my interest in the areas of phylogenetics, biogeography and biodiversity. Computational tools have expanded the possibilities of pursuing questions in these areas, including hypothesis testing.
Lots and lots of reading and practicing on my own time when it comes to basic programming in computing languages. I took a class or two but it was so general it was hard to really get at the capabilities of programs for the specific issues I was interested in. I just had to play around and get familiar with the computing languages to get them. Specific area-based workshops in computational biology have been a huge help as well. Their tutorials are often a great starting point for customizing scripts for my own work.
The math/statistics I've learned were mostly acquired in classes and reading text.
I plan to be at SACNAS on Friday. I look forward to meeting people!