oh god, the one that gets my goat and any other dairy animals in the vacinity at the time is the <insert expletive of choice here> could care less.
That means you COULD be more worried, annoyed, bothered about something. I could NOT care less however, means there is no single topic that interests you less than the one you are talking about. How hard is that?
Oh and coming in a close second is write me. Write me what? A letter? A poem? What? I demand to know, you have to tell me!! But if you just want to say write me, then PLEASE for the love of god and all things English, use the little word to.

Write to me.