Could it be? Is Amazon offering another useful app that I actually want to own for the 2nd day in a row? That's pretty much a first so far, with the Shazam Encore/SwiftKey tag team being a close second. What makes today's deal especially valuable is that there is no free version of Wolfram Alpha at all, so combined with 4.7 stars and over 1,800 reviews in the official Market, getting today's free app right away is pretty much a no-brainer.
Recently, Wolfram Alpha LLC dropped the official WolframAlpha app into the market. It is one of my favorite services and I purchased it ($1.99) as soon as it came out. For those not familiar, this is a clip from the "about" page of WolframAlpha to give you some idea of what this is all about:
Wolfram|Alpha's long-term goal is to make all systematic knowledge immediately computable and accessible to everyone. We aim to collect and curate all objective data; implement every known model, method, and algorithm; and make it possible to compute whatever can be computed about anything.