Well a voting booth would be nice if people were strictly answering radio button type answers, but I prefer it in a format like this due to all the variance in the answers. Speaking of which, I use:

• 5.003 (ouch! No, it's not my system. Yes, I know it should be upgraded)
• 5.6.0
• 4 other versions in between those, on various OS's

I upgrade when I can, but don't consider it a very high priority. If a major version came out (e.g. Perl 6) that would be a different story. Right now there are not many limitations in the language that really affect my day-to-day coding. We've come so far from Perl's humble beginnings that it is almost a point of diminishing return. Not that Perl is perfect yet, and it is good to always strive for perfection, but I don't see many things being added to it that would make people run out and say "How did we ever do without this?"