In ToB, is it possible to change Sarevok's alignment from CE to something more good or nuetral?

Yes it is, if you choose the right lines in dialog, (i.e. the 'good' ones) his alignment will change to Chaotic Good.

Spoiler below...
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I only know of the first dialog with him, but to start on the path of changing his alignment, you should tell him you wont make him swear fealty to you.
He will act extremly suprised, and will tell you how he would have made you swear if the positions were reversed.

Oh, then I have already fouled it up. :p I didn't trust him with a 10 foot pole, and made him swear an oath. Oh well, I guess its a reload for me, sometime around Christmas tho :p.

As I said, I only knew about the first dialog with him(I didnt play that far into ToB, something came up..and never got around to finishing) You may beable to change him still, just choosing the good dialogs, but I dont know.

No, you can't. Him not swearing the oath is a prerequisite for him changing alignment later.

Are you sure? I coulda sworn I did make him swear fealty, yet he still would change alignment...

I'm as sure as the guide where this was written in is correct. Anyway, he didn't change alignment before the end of the game for me even though I didn't make him swear on oath to me.

You can also use a little nifty save-game editing via ShadowKeeper... :idea:

Well I checked and I did make him swear fealty, however at the end he was CG... could be Ascension though.