If you are looking for experimental staff. What about hi frequency trading. When EMA is stable sell at EMA+1$ and buy at EMA-1$ or maybe not EMA but something else.
EDIT: No trigger for this should probably be Bolinger and stable EMA. Since Bolinger gets wider as soon as a price start moving again and EMA 10/21 must be the primery strategy again.
The problem is that the trading fee at MtGox is so high, it's probably hard to make money from some kind of high freq trading. But maybe I'll look into it in the future. As for using Bollinger bands as an indicator, I'm not sure what data is required to calculate them. The bot currently only has access to a limited amount of data (the price of the first trade at each sample point). But maybe that's good for some kind of trending/ranging-indication...