I'm working for Advanis, and while I can't say that it's done as much for the Perl community as, say, Activestate, I have gotten a few orders of magnitude better at Perl since I started here. Probably 60% to 75% of our work is Perlish, and it's a great environment for learning.

(And no, they're not paying me for this plug. Sad; I could use a new video card. :-)