Coworking is a growing concept for shared office space, particularly suitable for web workers, contractors, and independents. Some charge by the hour, some charge by monthly rent.
Google Group for coworking - arguably the best place for leads / discussions about coworking
Coworking wiki - arguably the most comprehensive wiki about coworking
http://blog.coworking.info/ - Coworking community blog
Where you can cowork [this is an incomplete selected list of cowork locations I've found]:
- Blankspaces.com - Los Angeles, CA
- theOffice - Santa Monica, CA
- truth coworking - Santa Ana, CA
- coworkingfullerton.com - Fullerton / Orange County, CA
- conjunctured.com - Austin, TX
- space12 - East Austin, TX
workatjelly.com - Jelly = casual coworking, sorta like a meetup but to work in proximity with others
- Jelly in Orange - for Orange County, CA
- Jelly in Fullerton - casual coworking meetups
- wiki.workatjelly.com - full list of Jelly locations
For longer-term commitments and a permanent office space, good options include HQ and Regus. This is great for when you don't need a whole office building, and want an office space for 1 to 5 people.