SelectSmart.com has a nifty presidential candidate selector. It lets you choose your positions on key issues and how important those issues are to you personally, then ranks the candidates against your hypothetical ideal. It's a good way to sort through all the spin and counter-spin supplied by the media.

This is what the Internet looks like, or at least the relatively large subnets. Mapped by Opte.org using some novel techniques to make the problem manageable.

(Image file is just under a megabyte.)