You may have already noticed this, but I thought it worth mentioning, just because it freaked me out for a moment.
I listen to a fair number of podcasts, and I really like the chapters feature. In iTunes 6 you skipped to different chapters via a button near the top of the iTunes interface. iTunes 7 doesn’t have that button, and at first I thought they got rid of that feature.
Luckily, they didn’t get rid of the feature, they just got rid of the button. You now access chapters via the menu bar. I personally liked it better as a button.