What are some easy ab work outs I can do at home?

I just want my tummy to be a bit flatter. My weight is perfectly fine I just want to define my stomach. Is there an easy method to use at home besides using those painful crunches? All I have is a bed, and the floor.. no sort of weights.
Anything ideas would be great, thanks. 🙂
Ugh.. I don’t want to lose weight really. I’m 120 to 130lbs, and I’m not sure if losing 20 pounds would suit me. I’m just trying to get abs, not lose weight.

Targetted weight reduction is quite tough, many people would declare impossible, but the one diet that clearly showed results for me was wu-yi tea, it can be seen in the resource box underneath, they have a limited number of free trials in stock, it was highlighted in Fox News and USA Today. I lost twenty pounds, it clearly does produce results!