[jwogrady]

It's a yahoo cert. The padlock says "certificate is not valid" while the cert details says "This certificate is valid".

I guess that means... "Technically it's good cert, but the Google Chrome dev team doesn't like Yahoo."*

*not that I disagree..... but who is making these judgement calls?

[zozbot234]

It'a a valid certificate for a bunch of Yahoo domains, but its use on paulgraham.com is not trusted. It should throw up a warning screen and let you click through to the site, either temporarily or permanently on a TOFU basis.