I'm sure WolframAlpha will save my ass when I'm desperately searching for an obscure formula, but for everything else it appears to be mostly useless.

All the results are images. When you find some bit of information you are looking for, you have to manually copy it, thwarting one of the main reasons we've been working so hard to get reference materials out of books and onto the net.

It doesn't provide information about the authoritative source for any of the information it provides in results. That means that if you are going to use any of the information, you must cite WolframAlpha as the authoritative source. That doesn't fly when there are regularly errors in the results. I wasn't there in 1961, but I'm pretty sure there was porn, and people called it porn..

This is half baked. It could wind up being really helpful if they would at least attribute sources for the information.