1. If it's "leaking" from the body then, the O-Rings between the body of the faucet got gunked up with minerals from your water. This interferes with the seal.
The answer is to take some grit cloth/very fine sandpaper and clean the inside of the spout body. Wipe clean. I would also suggest replacing the O-Rings on the faucet body, but at the very least wipe the O-rings and faucet body clean.
THEN: lubricate the inside of the spout body AND the O-Rings with silicone grease. It's translucent and readily available and the only thing I would ever use for a faucet repair. NOT plumber's grease, NOT WD-40.
Reassemble and enjoy.
2. If it's dripping, the you need a new cartridge. You can get them for FREE from the hardware store if you have the old cartridge to trade them. The problem is that Moen cartridges are water-sealed into place and you need a special tool to break that water seal. The special tool (just a tiny piece of specifically shaped plastic, really) comes, you guessed it - with the new cartridge.
Two possible solutions: a) bite the bullet and just buy the cartridge (~$25) or buy a Moen cartridge puller, usually available from the hardware store as well for about the same price. Ask, they might even lend you one.
The point of whichever tool you end up with is to rotate the cartridge itself inside the faucet body to break the water seal so that you can pull it out with a set of pliers. There will be a retaining clip to pull out as well.
www.plumbingpartsdepot.com/moen7300.gif
http://img2.timeinc.net/toh/i/a/plumbing/faucets-toilets-07.jpg
Good Luck.
You need to replace the cartridge under the handle
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