bjfangirl187 is currently writing a QaF/ Wizards of Waverly Place crossover,
Everything is Not What It Seems that aims to be as cute and fluffy as the Disney Channel source material.
gaedhal wrote an amazing angsty story called
Bell, Book, and Candle, using characters from the movie of the same name. The only thing these two fics have in common (beside Brian/Justin) is that Justin has magical powers. (He's called a wizard in one and a warlock in the other.)
Are there any other QaF fics out there where one or more of the characters is magical? Crossovers are good if at least one of the QaF characters has powers. Crossovers are a no-no if only the characters from the "other canon" have powers.