What is the best way to sell a used laptop?

[splashpot]

Ok, a few questions.

1. How much can I expect to sell my laptop for? I don't know anyone personally who needs a used laptop, so I'll have to sell online or to a store. It is a Dell Inspiron 6000 bought a little over 2 years ago. Normal wear and tear but everything still works.

Inspiron 6000
Intel Pentium M processor 1.60GHz
1280MB RAM
60GB HD 7200RPM
ATI Mobility Radeon X300 64.0 MB
15.4" 1920x1200 resolution screen
DVD-R/RW drive
Intel Wireless card (forget what model)

2. I did a quick google for "sell laptop" and came up with a few sites that buy laptops. How can I tell if a site is legit? For example one of the first hits from google was www.cashforlaptops.com. They're offereing me $400.

3. Ebay? Craigslist? Are there any better options? How do I find these places?