Proof the new 13" GPUs are slower... in Windows
Here's an interesting benchmark from anandtech - although the 2011 systems perform similarly to the 320M in OS X, the 320M is repeatedly better in Windows for gaming - the new system is better for apps as the i5 and i7 CPUs shine. In OS X - the results are different - the 3000HD is marginally better for gaming, probably due to apples shoddy NVidia drivers:
Review
So, the rule seems to be - if you use your mac for windows gaming and don't do much video editing/encoding - get the 2010 mac, otherwise the 2011 will be just fine.
Here's an interesting benchmark from anandtech - although the 2011 systems perform similarly to the 320M in OS X, the 320M is repeatedly better in Windows for gaming - the new system is better for apps as the i5 and i7 CPUs shine. In OS X - the results are different - the 3000HD is marginally better for gaming, probably due to apples shoddy NVidia drivers:
Review
So, the rule seems to be - if you use your mac for windows gaming and don't do much video editing/encoding - get the 2010 mac, otherwise the 2011 will be just fine.