We just sold our 2004 HCH. I used Edmunds.com to get a realistic sales price, then listed it in cars.com (via Recycler, a So Cal classified ads paper) for free. I had 8 calls in the first day and sold it for within $200 of my asking price.

Side story - since I live within 3 miles of work, I decided to get a 125-cc Yamaha scooter to commute. I gave the Prius to my wife and we sold her HCH. The scooter is a blast, uses $2.00 worth of gas a week, we have more room in the garage, and an extra $18,000 in the bank. Whee...