1. A $5 coin. Before switching over to the Euro standard, Holland had a 5 Guilder coin that was a pleasure to use. Four of these in your pocket in addition to paper money was enough to get you through the whole day. Now, Europe has a coin that's worth three dollars or so (2.5 Eu face value) and it just isn't the same. America's $5 coin should be sized mid-way between the nickel and quarter, be twice as thick as a nickel, and finished in a better faux golden color than the miserable Squawbuck $1 coin.
2. I think that the reverse face of the $1 or $2 bill should have the Bill Of Rights listed on the back.
3. Getting rid of the penny and round up to the nearest tenth of a dollar. You can get rid of the $1 note if you want, but be prepared to get a lot of change back. One problem that Europeans have is gathering an avalanche of change in their pockets at the end of the day. The Euro coin worth 2.5 and the Dutch 5-Guilder was designed to help erase this, and the US better think of something similar if we eliminate the penny and $1 bill. That's why I hope for a $5 coin and not some half-fast measure like a $2 coin.