I saw this today in the Fresno area
Business Journal:
There will now be quotas applied to the number of people allowed to hike up Yosemite National Park's famed Half Dome Trail.
In the name of safety, the National Park Service this year is requiring permits to hike to the top of Half Dome on Fridays, Saturdays, Sundays and federal holidays. A maximum of 400 permits will be issued each of those days. According to park officials, less than 400 people use the trail on weekdays while about 800 people use the trail on weekends and holidays, on average.
Permits are available up to about four months in advance to one week in advance exclusively through the National Recreation Reservation Service. Permits are not available in the park or on a fist-come, first-served basis.
Reservation procedures and timing may be different in 2011 as park officials are developing a long-term plan to manage use of the Half Dome Trail.
The cables hikers use to ascend Half Dome are usually in place May-October.
Yosemite National Park (NPS.gov) news release:
Yosemite National Park Announces Interim Program for Half Dome Day Use Permits to Address Visitor Safety Management Paper (4 pages):
Management of the Half Dome CablesNewspapers, etc.:Discussion on YosemiteNews.info forum: Half Dome PermitsDiscussion on WPSMB forum: quotas for half dome now?