Is there a website that shows historic price data? I need to find what the Bitcoin-Mt. Gox USD price was at certain historic dates and times (exact timestamp).

Is there a website where I can input a specific historic date+time, and get the rate for that time?

I believe that Bitcoin Chart's API might do the trick ... but I'm asking about a website with a UX, not an API.
I think this should help:
http://bitcoincharts.com/charts/

Here you can view all the historical data:
http://bitcoincharts.com/charts/mtgoxUSD#tgSzm1g10zm2g25zv

And if you need any specific date you can hit "Custom time". :)

Hope this helps.