To access the Valentine's Day countdown, log into FarmVille and the game screen should automatically popup. If it doesn't, click on the heart with arrow icon along the right side of your screen. You will then see that day's particular gift, and a button that allows you to "Ask/Share" in order to get that gift. You'll notice that there are 12 days total, but days that haven't been released yet will have a pink question mark instead of the revealed gift. If you are too late, you'll have the option to buy the previous day's gift with Farm Cash.
The Prizes (Spoiler Warning)Day 1: FarmVille I Love You Stand
Day 2: FarmVille I Love You Sign
Day 3: FarmVille XOXO Sign
Day 4: FarmVille Purple Hay Bale
Day 5: FarmVille Heart Bear
Day 6: FarmVille Caramel Bear
Day 7: FarmVille Fuchsia Greenery
Day 8: FarmVille Pink Greenery
Day 9: FarmVille Provencal Pot
Day 10: FarmVille Fancy Topiary
Day 11: FarmVille Flax Plant
Day 12: FarmVille Dogwood Tree
Bonus Prize: FarmVille Purple Valentine's Cow
Check out the rest of our Valentine's Day 2011 coverage right here.