Baking soda absorbs smell, so a small box of it will absorb weird smells in your refrigerator. You can also sprinkle some at the bottom of your dustbin to absorb away bad smells.
Baking soda is also good for cleaning silverware and silver jewellery. Rubbing your silverware with 3 parts baking soda to 1 part water will make them clean and sparkly.
It can be added to your laundry to remove odors and stains. It can also be added to bleach. Apparently, it improves the effectiveness of bleach and can make your white clothes sparkly white.
Vinegar is acidic and can be used very much in the same way as lemons. It is effective for killing most mold, bacteria, and germs, due to its level of acidity. A mixture of vinegar and water can be used to wipe clean most surfaces and remove ordors. I find it very helpful in cleaning out glass surfaces and mirrors.
Baking soda and vinegar is a powerful combination. You can clean and deodorize a drain or sink by pouring in 1 cup baking soda, then one cup hot white distilled vinegar. After 5 minutes, pour in hot water and you get a very nice, clean and odorless sink.
I like using baking soda, vinegar and lemons because they are all very green.
What else from the kitchen...?