St. Julien. Very fancy, very new, very expensive. Convenient downtown location.
Hotel Boulderado. Large, classic downtown hotel, about 1 mile from university. Highly recommended.
Millennium Harvest House. Not as nice as the other "top tier" hotels, but cheaper and very close to campus.
Boulder Marriott. Good hotel, less ideal location in the strip-mall district.
University Inn. Great location within walking distance of both downtown and campus; next to airport bus stop
Quality Inn. A short (but steep) walk from Duane.
Boulder Inn. A Best Western, southeast of campus.
Golden Buff Lodge. A Best Western motel in the strip-mall district near the Marriott.
Foot of the Mountain Motel. Small, "rustic" place in Boulder Canyon, at the extreme west end of the city.
Days Inn. On the southeast edge of town, but there's frequent bus service to campus.