So this is tonight. The live feed on the
http://live.grammy.com/ website is already working for me in London, UK. So I presume people outside of America can watch this in most places.
I believe the main ceremony doesn't get going 'til about 4am UK time, but the Electronic /Dance category (amongst others) is covered in a sort of "pre-ceremony" in the building next door. I seem to recall watching online last year as The Chemical Brothers were nominated in both the single and album category as was Jamie xx in the album category (neither won).
In fact as I type this, the pre-ceremony bit is starting now - 1st category is being read out. I think Underworld's category will be before bedtime (unless you go to bed really early).