Blogger/Blogspot is working fine on my end. Sometimes Google does regular updates to their products so expect this. Unlike Youtube you don't get a time frame unless its really important. This happens to Gmail regularly. Best thing to do is to wait it out and hope that Google fixes the problem quickly and swiftly.
I could not enter into Google and blogger few days ago but after a couple of hours I was able to log into it already. I guess they are undergoing some updates in it...Right now I got no problem accessing google or blogger
Impossible, clear you private data, try to log on again, if still doesn't work, try to login to your gmail account and then go to blogger.. I think that would be Impossible if google down, especially blogger, coz they own the technology..LOL