Well topic & description says it all..

Before, people reccommended installing itunes 6.5, but then overwriting the aac encoder dll's with those found in 6.2.

Now iTunes 6.6 is out. So what's the situation? Still use 6.2 encoder? Try the new one? Panic?

panic is always the prefered choise of action.
take your time and run through your neighbourhood, screaming things like: "I KNEW it, hahaha, it's all lost, haahahaaaaaa", the usual stuff.
after that, do the the panic course again, just to be sure that... well, just to be sure.

when you done with it, search the forum for changes in 4.6 that affect soundquality. IIRC, it's still pretty much like 4.5.
you might want see if the above method still works with 4.6
or the hassle isn't worth it for you, but that descission can only be made by you after abxing the different version for yourself.

btw. are you SURE you meant itunes 6.6? or are you talking about quicktime itself?

iTunes 4.6 is available.

iTunes 4.6 uses the same encoder as 4.5

I think he was talking about the preview version of Quicktime v6.6 found in the Mac OSX v10.4 Tiger preview.

No matter what iTunes version you use, if you use the same version of Quicktime with it, your files will encode the same.

Ack, true enough I meant itunes 4.6 and I sortof assumed that it contained quicktime 6.6 and then drank something alcoholic and let the numbers flow together...

Can I still go for the 'panic' option?

As for abx'ing myself.. perhaps later, for now I'll trust the concensus here..