Scutigera coleoptrata, big, ugly, and very fast.
 

I never have seen this bug before until resonantly. They are all over the basement and very fast. Are these creepy things deadly?

Here is a picture of one I found on the internet.

http://i72.photobucket.com/albums/i2...leoptrata1.jpg

House centipedes are just scary looking. They rarely bite, and if they do, it's no worse than a bee sting (Wikipedia).

Just how many are in your basement? You may need to do some caulking and dehydration if it seems like a problem to you, as in general with any other insects that can invade the home, there has to be a way in and a reason why they would want to be inside, namely shelter and water/nourishment.

But house centipedes are also great in getting rid of other insect pests as they are predators just like spiders.

I've got a 1024x768 picture of one as my desktop at work :)

They've got poison claws, but as stated, they aren't deadly. And they're more afraid of you, than you (should) be of them.

So far I've only seen three of this things.

To be perfectly honest, if you know the scientific name of an animal, I find it hard to believe that you don't know if that same animal is dangerous.

Since your question has been answered anyway, I'll close this thread.