Perl Monks is far better than Stack Overflow for Perl questions, as they actively encourage the discussion that Stack Overflow avoids, leading to a greater understanding afterwards as opposed to just something that works.
I can't count the # of times a super helpful question was closed on StackOverflow for being "off topic" or being likely to cause a flame war. I do like Perl Monks, but wish the format was a little different UI wise. Def still usable though.