Just a note to point out
this great table of controls compatibility at Office Online which includes all versions of InfoPath. It makes it easy to see the differences between versions.
About Hilary Stoupa
I wandered into development after working as a business process analyst for a global manufacturing company. I create InfoPath solutions for our clients as well as work as a developer on company tools that extend InfoPath. I've also been instrumental in creating the InfoPath Master Class training provided by Qdabra.