Hi Mr Beers,
You'll find the people here on cruise chat very friendly and helpful.
Seattle airport is approximately 15 miles from the waterfront. It is about a 20-30 minute taxi ride, depending on traffic. Approximate fare $30. You might want to check out this shuttle
A new Terminal 91, is being built to replace pier 30 and was projected to be done in early 2008. So I would verify the day before you leave home that the ship is still going out of Pier 30. A helpful site might be this