I think wolframalpha has a lot of potential, sure it doesn't have all the data sets it needs yet, but given time, i'm sure it will manage to provide meaning to structured data...I look forward to seeing this project evolve...
It's not google, and to be honest I don't think its even trying to be google, it's trying to provide clear answers to questions using its own knowledge banks.
Google is a search engine, and is still my favorite search engine. Wolframalpha is a different beast entirely, and will probably become my favorite 'computational knowledge engine'...think both of them will exist side by side quite nicely.
My 2c ;)