Seriously, people are complaining about this? I think the whole issue is pretty straight forward - for cost/power/size reasons they didn't want to include a dedicated graphics card in the 13" model. Apple want all-round machines that are suitable for everyone, they can't afford to be using crappy intel graphics and needed a more balanced platform. Thus, the core 2 with nvidia graphics is the obvious choice. Honestly, unless you don't do anything with the mac that needs graphics, the core 2 with nvidia is the far better machine.
I'm not an apple fanboy, (especially seeing as in Australia there seems to mysteriously be a 15-20% increase in price over US prices, after tax and exchange rate are factored in) but it does annoy me that people whinge at them for making good decisions that will benefit the most people w.r.t. hardware components.