true_INFP - 8:43 pm on Aug 25, 2010 (gmt 0)
I can certainly see how the average person entering a brand search like [IBM] would be well served by more than 2 results from the IBM website. And on that particular search, even Big Blue doesn't get all the results, not even #3 (Wikipedia) or #4 (Yahoo! Finance).
Probably a slow roll-out operation or A/B test, then. When I searched for "ibm", I got the following organic results: