The escalating costs of tuition at California's public universities and community colleges is bad enough. What's almost worse is the rapid and unpredictable spike those increases represent. Students in the Cal State University system, for example, will be paying 30 percent more for tuition this fall over the previous semester. Incoming and returning college students get to look forward to enrollment limits, bigger classes, fewer offerings and steeper fees -- and this comes on the heels of deep cuts in 2003-04. In a state where we like to talk about commitment to education, it's unconscionable.