One thing why you shouldn't get your hopes up - the Treasury is finishing up an 18 month study of this issue. Whatever money we spent on this study is a complete and utter waste. Several countries have gotten rid of their $1 bills, and not just third world banana republics - trading partners like Canada, England, and even the Eurozone have recognized for decades that the $1 bill was a money waster.
One area of the economy that would be affected is strip clubs. I am not sure strippers would like to be pelted with dollar coins for their performance. However, this could easily be solved by the strip clubs printing their own bills and then patrons can purchase a bundle upon entering. The workers would then turn in their gathered bills at the end of their work day for real money. (Sure, this would eliminate a lot of the under the table transactions that probably go on, but that would mean more tax dollars - its a good thing!) Disney does this as sort of a souvenir gimmick (or at least they did 30 years ago). I have Disney Dollars (with portraits of Mickey and Goofy) that can be used as real money in the Disney themeparks, but have no value elsewhere.