Many will be happy that they will be able to use 50,000+ built-in algorithms, and 10+ trillion pieces of continually updated and curated data via the Wolfram|Alpha app for iPhone.
I used Wolfram Mathematica through out the university career and still continue to do so. But being able to have most of those capabilities in the palm of my hand, from where ever I am, makes it a reason to smile and thank the Wolfram team for the fabulous app.
In a smaller scale, I am glad I can leave my notebook or netbook behind when I go on star gazing trips.
Also the Wolfram|Alpha knowledge engine is avialable over the web if you did not know already. I have made it my default home page!
The app is available from app store.