I like how they have gotten rid of categories. I presume they have done so out of efficient laziness (you aren't gonna need it). Also, I'll bet they will observe the searches to see what people are actually looking for and then categorize after the fact.
After installing a few extensions (adthwart, sidewiki), I've noticed some problems, so I'd say that the implementation is still a touch buggy. But, still, this is an awesome step forward for Chrome.