Software ain't cheap to develop, and there are quite a few new features (and many minor improvements) that make it worthwhile in my opinion.
Those features would be much more impressive if one was constantly connected to the internet, (like the iPhone would be,) but when these updates only benefit the iPod Touch users when they are in a wi-fi zone, it's really not something that I can't live without.
When you buy a $300+ product, you shouldn't have to pay extra money for "improvements" that should have been included anyway. The note syncing, the "push notifications" (for app updates), and the safari improvements are things that should have been for free, because they are "fixes" for things that you paid for when you bought the iPod.
The rest, mostly just frills, and I can see charging a little for those. $10, though? Mmmm... I personally don't think it was worth it.
But that is just my opinion.