I don't remember Mathematica was ever like this, although I didn't use Round[] much either. It does what I would expect it to do today:<p><a href="http://reference.wolfram.com/language/ref/Round.html" rel="nofollow">http://reference.wolfram.com/language/ref/Round.html</a><p><pre><code> Round[x]
gives the integer closest to x.</code></pre>
I'm surprised none of the answers seem to emphasize IEEE 754, which recommends ties-to-even rounding as the default (but allows ties-away-from-zero, which is what's more familiar to me and probably the person who asked the question in the first place).