I would think it's a fairly common spider, but I've never seen it in my house before. Can anyone ID?

It's a woodlouse hunter, Dysdera species. They are recognizable by the color (front half reddish, back half greyish), the way their chelicerae stick forward (porrect), and the way their eyes are all in a tight clump. Need a location for species-level ID - if N. America then Dysdera crocata.

Another picture:

http://www.flickr.com/photos/gurum/6962538306/sizes/l/in/photostream/

The magnification distorts how large it is; it's really only about a half inch long.