The main difference is the manner in which it is steam cured and unfermented.
It is much more moist and finer grained than typical snuff. It is almost like a "putty".
From what I understand, it delivers a greater nicotine kick with a lesser level of health risk.
In my opinion, it is not as "tasty" as a decent snuff (i.e. Copenhagen), but it isn't bad either.
It is claimed that one does not need to "spit" when using snus. I wouldn't know since I chew Cope and don't spit anyway (insert joke here).
