Two movies and the Ultimate Rotation Control app (well worth the three bucks). Still have two dollars left.
You can get a screen auto/lock rotation app that also works on the home screen... for free! "Screen Orientation Control" from the play store.
I spent my free $25 only on 2 things so far.
1. Beautiful widgets HD Not sure if I really needed to spend the money on it the day I got my N7....but I did with some regret now after getting to know android and the N7.
2. Nexus Media Importer. Use external flash/usb drives with NO ROOTING! This was the best purchase so far.
At this point, I am waiting to see things appear in the next 2-10 months before I use up the free store credit. Because I have seen apps come up for free that were the same type of apps that were once pay apps.....I will hold off and only use my credit for something I really need or seem worth while.
I don't play games on the N7 as I find them to be extremely boring on a 7 inch screen and do not want to use external control devices. I have several PC's to play games if I need.
I was tempted to get one of the pay keyboard apps....but I like the voice command on the stock keyboard and have not found any pressing needs for a diff keyboard yet. I do not type that much besides limited emails and find the voice to text software extremely useful and works very well in the mean time.