Businessweek has a detailed article which covers Apple's steps and mis-steps in the educational market over the past few years.
While Apple's most recent educational results appear to be disappointing, Businessweek notes that sales to higher education are the best they've been in seven years, and that based on October surveys, Apple is predicted to make up 30% of K-12 school sales in the next year. This would represent a significant rise from Apple's most recent results.
In addition, Apple's strengths with Mac OS X, competitively priced laptops, and powerful G5s may aid in the turnaround.
The author still cautions though that Apple still faces stiff competition from Dell and HP.