1.  arbitrage between different currency types
2.  maybe a hosted option
3.  store a history of each trade for review
4.  semi-intelligent trading (don't make a trade if its going to lose money)
5.  would be GREAT if it had really easy interface with detailed explanation of what the affect of adjusting each configuration will do...  not just a link to bitcointalk.org thread with 100 pages of discussion on the bot...