Now, I know a lot of the other LJ-based sites are using Perl 5.8, so... Any problems, particularly with international characters? Any weird bugs that you've reported and nobody's fixed?
Most of us use Perl 5.8 for our dev machines (except me) but we all test with ASCII text generally, so we're not very likely to see problems.
BTW, the reason we're thinking of moving to Perl 5.8 is because all the Perl profiling stuff runs much more reliably than in 5.6 (where it tends to segfault all the time) and because Debian sarge and the rest of the world are using 5.8, and because we can then use more of Perl's native Unicode stuff, eventually making it a requirement.