For wishlist / tracking, I use AppShopper.com (they also have an app). Lets me track when something goes on sale - I get an email so I know to wait to buy it, etc.
Would be nice to be built into the App Store, but AppShopper seems to work pretty well.
That way I can narrow down what I want, come back to those I'm not sure of, etc. Seems like it would make it more likely to buy an app and make apple some more money.
Am I the only one missing this option?