It would be cool if I could get an objective answer which results I prefer. Just give me the union of serach results in arbitray order, I will rank them, not knowing which is which. hen over time it could give me an objective measure of my preferences.
This is not impressive... it's just a bunch of iframes. How about stripping the styles of the results, and displaying some kind of visual diff.
As a hack it might not be impressive, but I found it useful to see the presentation side by side. At the moment, I'd say Bing is definitely much cleaner and more pleasing. The speed seems about the same but it's hard to judge the results without lots of work. It's amusing, though, to see how closely Bing mimics Google especially in the first items of the header: web, images, video ... It would also be nice if I could just close one side or the other.
In this case it's the whole presentation I think we're trying to compare, not just the relative positions of individual results in the list. It would be fun to calculate Pearson coefficients for each query, based on hit-URL lists, but I suspect you actually learn more by just looking at the two...
search for "dvcs comparison" (unquoted). bing returns many completely unrelated dvd/spam sites, while google is spot on. MS still have a lot of work to do.