Hey girls..I subscribe to this lovely gardening blog and site called You Grow Girl and she had (what I think is) the coolest idea for keeping tomatoes healthy....
"Here’s what I do. Organic milk tends to go bad in the fridge faster than non-organic. I only drink milk in my cappuccinos so I often have lots of spoiled milk in the fridge. I dilute the milk with water to a minimum 50:50 ratio (I often dilute much further than this) and either pour it directly over the plant leaves or pour it onto the soil at the roots. I used to put it into a spray bottle first but am too lazy to take that extra step now-a-days. I should add that this is the only time I water tomato leaves directly. I am careful to water the soil only on all other occassions. This is because tomatoes do not like wet leaves and can develop fungal diseases as the result of too much humidity and moisture sitting on the leaves for long periods of time."
Her site is SO beautiful, I can't get enough of it, and her tips are really interesting--not run of the mill.