Now that we are in public beta, we can be queried against using the SE Data Explorer. I've noticed that some software is the answer to man different questions. For example IrfanView.
With a little bit of simple natural language processing, (probably some hacky regexs) it should be possible to determine which product is being recommended in each answer, and thus to run a query against all answers to find which products show up multiple times.
I think it would be pretty cool.
Further things we could do, once we have a programitic way of identify programs the answer speaks of is generate (on say users personal websites, not on SE) Program Lists, linking to there recommendations. Eg list of Image Editors.