When I try to view my Gmail  account, I’m getting a “Server Error: Temporary Error (502)” message that says:
Weâ€™re sorry, but your Gmail account is currently experiencing errors. You wonâ€™t be able to log in while these errors last, but donâ€™t worry, your account data and messages are safe. Our engineers are working to resolve this issue.
Please try logging in to your account again in a few minutes.
Very strange. Even more strange is that I can log into one of my Google Apps for Domains  accounts just fine, just not my main Gmail account.
Update at 10:30 pm: Seems to be working fine now. Not sure how long it was actually down. Around an hour or less from what I saw, but who knows how long before I checked it went down, and how soon in the interim it came back up.