I almost called this "Oh the Places You'll Fart" but that would give it away.
That's really all I have for you.
Oh, wait. If you own a Wii, or if you don't own a Wii, own a PC (which I'm pretty sure you do) and don't like spending money on stuff you can get for free, check out Cave Story. It's a great little platformer made by one dude, apparently. It's a lot like Metroid in that you are 1. In Caves and 2. Get upgrades and shoot things.
It has existed for a while, so sorry if this is old news, but since it just came out on the Wii, I thought I'd mention it.
I like it.