Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Where should I park my rainy-day / emergency fund?
I am using ING for my emergency savings, but sometime last year I discovered SmartyPig. As of 4/24/2010 they offer 2.1%, which is even better than the 1 year CDs at most banks. I've switched two small accounts to SmartyPig and plan to switch my emergency savings. Their accounts are geared around monthly contributions, but you don't have to use that feature.