Ooops I forgot...
250 points for a +1 to a class skill, and 400 points for a non-class skill.
We thought about claseless, but frankly, with all of the multitude of classes available out there to use, we opted to keep them. As more supplements come out, the more classes seem to bve availalable, and that is not even counting the thousands of prestige classes out there.
For a fantasy environ, we opted to keep classes.
For a modern or futuristic setting, you could use the same rules using the CoC system generation, or the D20 modern. Those are both two takes on a modern generation system, and both have their merits and flaws.
y'know. I like the idea of some "template" to build on. Mostly because it inspires ideals. But some people don't. You could probably combine D20 modern and D20 CoC and get either class or classless. Take the ideas above, adjust to your tastes and walaa, you have levelless, and classless. Then you just need to figure out how to gauge challenges and experience.
Razuur.
And BTW - Mutants and Masterminds IS all that and a bag of chips...