To expand on digitalpoint's entry; Network Outage, I have found an other thread on the topic.
Loren Baker reports over at Search Engine Watch forums that Google DOWN - 502 Server Error. I wouldn't say anything but an other member verified it was down. It seems to work fine for me, but the report came about four hours prior to me trying it out.
A 502 Error is a Bad Gateway.
The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request. This may be a temporary or permanent condition, please try again at a later time.
All seems to be ok now.