Favorite fruits are oranges, apples, kiwi, bananas, berries of almost any kind. I don't really have an order of preference, I just like whatever is in season and I can get locally (when possible).
I'm not a huge melon fan, especially for melons that aren't named watermelon.
Kiwi skins are gross, don't eat them.
I change it every 30 seconds manually.
Not really, I use http://sig.grumpybumpers.com/ to return a random sig from a collection I have. I think I have like 20-25 on there atm