I second this. I added 'AppiRater' (https://github.com/arashpayan/appirater) to one of my popular apps which users weren't reviewing. As soon as I added AppiRater the number of reviews increased a lot. I also noticed that it didn't increase the number of negative reviews which was a surprise.

If you do it right, then yes it will help your reviews. I suggest actually using iRate (https://github.com/nicklockwood/iRate)

The advantage of these libraries is that you can ask at a specific time, say the tenth launch.

As you can do with pirater. You can also set a time limit, a combination of both, remind the user again, or give them one change only. AppiRater is very flexible, not sure what iRate offers over that.

Which page do you direct users to - the reviews page or the main app page? Do you have any data on which converts better for getting new star ratings?

It goes right into the review page by using a special url.

My hunch is that the main app page would convert better for getting star ratings. Have you tested both?

The potential problem with the reviews page is that it makes it seem to the user like they have to write a review in order to give a star rating. On the main app page, however, they can just provide a star rating.

Thanks! Good idea. Which library are you using?

Try Appirater: http://arashpayan.com/blog/2009/09/07/presenting-appirater/

Is there anything like this for Mac apps?

iRate works on the Mac App Store as well (https://github.com/nicklockwood/iRate)