Sure that is a neat trick (Although the rules fiend in me wonders if the spell was stilled and silenced). This is exactly the reason that I like mage hand and prestidigation being at wills in 4th edition. After all, a 4th edition wizard would have gotten the same effect with mage hand.
As a side note: A really large number of these stories seem to be based on the application of the Grease spell. Is that because there are only a few spells in 3.5 that are really that flexible?
Well, a 3.X mage could have used Mage Hand to do that as well, though not "at will" unless he had taken a particular Feat.
As for Grease? It gets used a lot because its a popular spell with both combat and non-combat applications. In a sense, its the quintessential low-level flex-use spell, just like MM and Sleep are frequently cited in low-level combat discussions.