Is there an iPod locator? I know the iPhone does that, using me.com, but I don't know anything similar for iPods. I have an iPod touch and, sometimes, I forget where I leave it, only knowing it's on my house.

If it was my cell, I would dial the number and listen. Is there a similar app for iPods?
Your question and Webs' answer answer the question. With me.com, you can send an instant message to your iPod touch. Surely it needs WiFi turned on to receive the message. Additionally you can make the iPod beep for 120 seconds, and you can lock or reset it from remote.