When did you first try Lisp seriously, and which Lisp family member was it?
January 2004, Common Lisp.
What led you to try Lisp?
I'd already been convinced, since 1999 or 2000 when I'd read Eric Raymond's bit about Lisp making one a better programmer, that Lisp was my ultimate destination. Lisp was clearly the most expressive language I'd ever seen. However, I wasn't the best programmer in 1999 (hardly a programmer at all at the time, actually), and the learning curve seemed steep. So I read some Lisp tutorials, played around a bit with various Lisps and Schemes, and went back to writing things I could finish in various other languages. My progression was
What other languages have you been using most?
RXML/Pike, Python, PHP
How far have you gotten in your study of Lisp?
I'm still a bit hazy on the conditions system, but am able to crank out software that works, and have built some possibly-useful-to-others libraries. I'm currently writing an online classroom system in Common Lisp.
What do you think of Lisp so far?
I love it! I'm all about reducing typing, and Lisp has enabled me to do that incredibly well. It's also true that solutions in Lisp take somewhat longer to design than solutions in Python, but this is mostly because it's so easy to throw in a little more functionality in Lisp.