Cross platform calendar(s)

I have a 'new' iPad and am finding the default calendar useful and would like to be able to run and sync it -- or a similar calendar -- with my W7 desktop and a (coming soon?) droid phone. Without having looked too closely at it, I guess Google calendar would work but I'm sure there's more than one solution out there.

I am hankering for a calendar that could do a little more than the iCal -- different colors for different types of events: business, family, friends, entertainment and just penciled in, for example -- and sync with the other two platforms.

Anyone else on here have a solution you use that would work with this setup?

"I used to be tech savvy, until some time after I turned sixty..."

Phil in Houston