Here are the hotels where we've set aside blocks of rooms:

Hotel Vertigo. New rate as of 2/18/09! Formerly called the York Hotel, the Hotel Vertigo was featured in the Alfred Hitchcock movie Vertigo. The hotel features a concierge and newly renovated rooms. You can make reservations as part of the Kirchhoff-McArthur wedding block by calling 800-553-1900 or clicking here. Book by Feb. 28 to get this rate.
$89/night
(If you already booked a room as part of the Kirchhoff-McArthur block, you will automatically get the new rate.)

Hotel Carlton. New rate as of 12/30/08! A block away from the Vertigo is this hotel, ranked very highly on TripAdvisor.com. The rooms have been redone in the last few years, the hotel offers a free town car to Union Square (by arrangement with the front desk) as well as a free wine reception every evening, and a restaurant (Saha) is located in the building. If you arrive a day or two early, check out the Joie de Vivre Hotels' Golden Gate Greeter program (informal, free tours given by volunteers—more information on the JdV website). You can make reservations online by clicking here. Book by Feb. 27 to get this rate.
$75/night
(If you already booked at the old rate, $109/night, you may want to contact them to make sure you get the new rate.)

If you require budget lodging or parking during your stay, we have set aside a small block of rooms at the Buena Vista Motor Inn on Lombard Street (in general, Lombard Street is the place for safe-but-budget accommodations in San Francisco). You can make reservations by calling 800-835-4980 and identifying yourself in the McArthur-Kirchhoff group.
$74/night

Getting here:

We've registered our wedding with Midwest Airlines so you can take up to 10% off your airfare if you are traveling to the wedding. You can get the discount by: a) visiting their website and entering our code CMZ4564; b) calling them at 800-452-2022 and mentioning this code; or c) or by booking through your travel agent (again, mentioning this code).
(Fine print: You will receive a 10% discount on tickets purchased at least 60 days before you travel, or a 6% discount on tickets purchased within 60 days of travel. This discount applies to travel to SFO between March 14 and 28, 2009.)