Super awesome update! Bukkit 1.3.1-R1.0 is now out! Just ran it on my server, and I was hoping to see something positive because of a build that mentioned something about managing an event deprecation configuration (something along those lines) in its bug fix list. Just ran it, and there were no errors in the console whatsoever!
I'll keep trying things and let you know if anything shitty crops up.
EDIT:
It seems there's been a good few things fixed, and it runs as smoothly as I'd like it to. However, there's still a few bugs and no one's getting anywhere with NoLagg until the author commits changes that make it viable with 1.3.1.
'NOTHER EDIT (mainly for Tunes):
Just looked at the author's Github - they have actually committed code so that NoLagg now works with 1.3.1 servers, available here:
https://github.com/bergerkiller/NoLagg. Just needs to be exported and uploaded to Bukkit. Oh, and there's a download available from the Github in a "TEST2" stage.
"TEST2" seems to work fine on my server, but I'm going to keep an eye on it and see if it returns any errors.