There is a new mod just posted that claims to have fixed the issue introduced with the final official patch 1.9 for the game that causes the de-synchronization of sound and lip movement on NPCs when speaking dialog lines - the infamous lipsync bug. It's an SKSE DLL plugin so SKSE will obviously be required to use it. I'm not on my system with Skyrim installed at the moment so I can't test if it actually works, but figured people would want to know about it in case they missed the postings and discussions elsewhere. I have nothing to do with this fix, just posting it here so it gets some more attention. Here's are the links:

http://www.nexusmods.com/skyrim/mods/75951/?

https://www.reddit.com/r/skyrimmods/comments/4lh37u/the_author_of_crash_fixes_has_fixed_the_skyrim/

Technical explanation of the problem and the fix by one of those investigating the issue:

Anyone test this out to see if the problem is finally solved?

It's working a treat for me Urtho. Up until now, the only NPCs without the bug in my games are the voiced ones from newer mods. This even fixed my antique http://www.nexusmods.com/skyrim/mods/46142/? mod - Goonie now lip-syncs correctly too!

I've only been poking it here and there but it seems to be handling the job quite nicely. Knew someone would eventually figure it out

I just LOVE the modding community here. Seriously.... without you guys, WHERE would we be?

And Arcadia there in the header/hotfiles image didn't even need to doff her top to get the mod to the #1 spot on Hotfiles.