zucchini rot

zucchini rot

hi all! my friends are tired of me talking about vegetables. i live in the bay area of california, with a moderate climate year round. i am just doing container gardening this year because i live in a big apartment building. luckily there were some unused planter boxes right below my balcony. i have been surprisingly successful with tomatoes this year. usually they turn red when they are about the size of a cherry tomato, even if they are supposed to be beefsteaks. i am growing one plant each of tiger-like, gold nugget, big beefsteak, and early girl tomatoes. i have had amazing harvests, especially from the gold nuggets (yellow cherry tomatoes). i also have french, purple, and pole green beans, some corn, two each of green zucchini squash and yellow zucchini, bell peppers, and basil. you can see pictures of most of it here. i would call myself an advanced beginner. anyway, i'm having a problem with my yellow zucchini squash. they got HUGE, and are very prolific. at any one time i probably have a dozen little zucchini growing on each plant. many of them grow up nicely and taste delicious. but for the past month or so many of them will get rotten on the end while they are still young. i thought maybe the flower was getting waterlogged and that was contributing to it, so i tried removing the flower earlier, but that didn't help. the end just sortof shrivels up and gets moldy looking, gray and brown. anyone know what this could be and how i could stop it?
my loverly room

my loverly room

The cabbage family 2009

The cabbage family 2009

Unidentified Plants (Again)

Unidentified Plants (Again)

My front lawn

My front lawn

An overview for Helenatroy.

An overview for Helenatroy.

1st time posting my room

1st time posting my room