So, here's the skinny on when to say what:
1. The pronoun "I" is a subject pronoun, no matter what. The rest of the sentence should either be about the person speaking, or that person and someone else.
Examples: I like ice cream. She and I think alike.
2. The pronoun "me" is always an object (direct or indirect) pronoun. In other words, it is not the subject of the sentence.
Examples: He loves me. (The word "me" is a direct object receiving the action of the verb "loves".) He bought the CD for me. (The word "me" is an indirect object telling for whom the action was done.)
Here's what NOT to do:
"He bought the CD for Andrew and I." NO, NO, NO! "He bought it for Andrew and me" is correct.
"Give it to Angela or I when you're finished." NO! Would you say, "Give it to I"? When in doubt, take the other person's name out and see what it sounds like. If it sounds wrong with just the one person in there, it IS wrong!
While we're at it, a lot of people misuse pronouns in general. I hear a lot of people say things like, "Him and I like the same team," or "Her and I have been married a long time." Ugggh! If you just can't remember that "him" and "her" are object pronouns, or even know what an object is, then use the trick I mentioned earlier. Obviously "Him like the team" only works for bad impressions of Frankenstein's monster, but that's because "him" can't be used as a subject, ever.
Okay, I didn't mean to rant, but General Hospital pushed me over the edge. ---T