What's the Plan?

So this spring is beautiful. I can't remember when I have seen the flowering trees bloom so profusely without a freeze. But all this early beauty begs the question, "What am I supposed to plant this year, and when?" While these warm days make me eager to begin planting flowers, I have been burned before by late freezes. Although this year, a freeze in April would seem late when it should just be called seasonal. And it's not even April yet! What and when?!