Apparently there's been quite a stir started by my use of the term "syntactic sugar" to describe the featureset of C# 3.0, and more than a few people are wondering what I mean by that. Simply this: that the C# compiler isn't doing anything fundamentally *different* than what you could easily do using the existing facilities of the language--in essence, it is making certain things easier, not possible. So, for example, right now the C# compiler does not allow for inline assembly CIL expressions (though I wish it would, quite honestly), so adding this as a language feature would be a non-sugar feature. The implicitly-typed local variable, on the other hand, is just an easier way to declare a local, nothing else changes once the compiler has finished its pass over the keyword "var".
It's probably not the most rigorous definition of the term, and I'm probably using it wrong, but that's the beauty of expressing an opinion--you get to learn just how wrong you are from a variety of different sources. Thank God for the Internet! :-)