Unfortunately not. The ship I was on last summer (2008) as still $.10 a minute and was SUUUUUUPER slow. I ended up getting internet on my phone and tethering to my computer – but that only worked because we were always near U.S. land.

Check this out:
Internet Connection on Cruise Ships

If you find a cruise line that does offer this, tell us! Alas, most of them are technologically still in the early ’90s.