I have to say I'm a bit stunned by some of the comments here.
This is the worst update ever ? Why ? If your laptop brings you everything you need, does it matter if it does so with an i5 or a C2D ?
Everything's not about Mhz guys.. Just take a look at the 13" specs globally : powerful processor, powerful graphic chip, 4Gb of ram, 10 hours of battery life, awesome trackpad, wifi n, bluetooth, ethernet 1000, firewire 800, sd-card etc..
Who wouldn't want a laptop like that ? Yes it's not the very last Intel processor, but do you need that in the first place ? I mean take a MBP, use it for a while, and dare to say that it's not a wonderful product.
I have a MacBook Unibody (october 2008) and there are no things I can't do with it (and even if there were, it would be things that are not meant to be done with a laptop anyway). That's just the Mac experience, and I'm ok with my processor being a C2D instead of a i5, because frankly, take a laptop of another brand with an i5, I'm pretty confident that it doesn't respond as well and that it's not as pleasant to use as a MBP.
Oh and sorry for my english
Cheers from France !