In this post, Logistics centered around how to get to downtown from the airport (SEA - commonly referred to as SEA-TAC for Seattle - Tacoma).
As you would expect, the Seattle airport is almost always busy. Some airports have periods where almost no activitiy is going on. That is rare here. Signage is good throughout the airport on how to get to Baggage CLaim and Ground Transportation. If your flight comes into the "N" or "S" satellite terminals, you will need to take at least one train to the main terminal.
Denny Cherry has a recorded webcast that does a great job on going over all of the options on getting to downtown. You can find it here. He will go into more detail than I will about transit and after hours as well.
Rental Cars are available at SEA-TAC, but I believe that if you are truly coming for the summit that it will be a huge waste of money. One thing to note is that there are several rental car companies that require a shuttle to get to and makes it a little more difficult to return but are cheaper. If you do rent a car, you will need to park it somewhere. The convention center parking is convenient, but not cheap. Hotels also charge $20 - $30 per night. There are severall rental car locations downtown. If you truly need to rent a car to get somewhere for a day or perhaps to explore the scenery before/after the Summit, I'd recommend planning accordingly.
Taxi Cabs and Town Cars are also readily available. Fares (with a tip) will run about $45-$55. If you share a cab with two other people, the cost isn't that bad. The benefit of course is that you get taken directly to your hotel and do not need to wait until the shuttle is full before leaving.
Shuttle Express also offers a Shuttle service (which is sometimes a bus) to downtown hotels. Costs for using this service runs about $15 and you can also purchase a round trip ticket at a discount. I've used tis service on several occassions. On occassion, you may have to wait until a shuttle is full enough to go.
There is also a fairly new Light Rail service to downtown which costs about $3. There is a stop (Westlake) which is about 2 blocks from the Sheraton. This is Pine between 4th and 5th. Walk up Pine to 6th. Turn Right - Sheraton is one block ahead. The Light Rail service does NOT run 24 hours per day. This option may not be available depending upon you departure time. Denny does a great job discussing this in his webcast.
If you are planning to spend some additional time in Seattle before or after the confeence, check out the PASS Summit "Explore Seattle" webpage located here.
See you in Seattle!