I'm also a great fan of baking soda. Ntuc only sell the hammer brand at times, thus whenevr I happen to see them, I will buy at least 2 boxes. They usually have the smaller boxes, but i think bigger box more "hua suan".
As for the usage of baking soda: I always put some in a spray, add water , then spray on oily plates/cups etc, can also spray onto clothes, stove, whatever is dirty, but if i remember correctly, things made of aluminium, cannot use baking soda, cos will become black.
One great use of baking soda, is to clean the stains on melamine bowls/plates. Dry the bowl, and pour some baking soda onto the stained surface, then scrub, it is very very effective!! I do that periodically for my kids' melamine bowls, and always look like new ^^