No!  If you got an response from someone claiming to be the Craigslist CEO for an ad you posted on craigslist do not believe it!  The name of the CEO is actually Jim Buckmaster.  Be careful, though, as scammers can still change their Contact Name and visible email address.

Here is the email I got from a Gerald Darr who was using the email chingi797979mu@hotmail.com

Attention Craigslist User,

My name is Gerald Darr, Chief executive officer of Craigslist. We have recently partnered up with The apple company for a one-time promotional event today, we are giving away free Apple iPads to randomly selected folks who have published an ad on C-list. You have been chosen as one of our latest winners for today. We randomly choose numbers to match up with ads on Cl and your ad matched with our latest drawing.

We have partnered up with Apple to advertise their most popular product yet, the Apple iPad. Once again, we are operating this campaign for one-day only. All you need to do is CLICK HERE to go to our website made for this promotion and enter your email to get yours for free. Simply make sure you enter your email so we can locate our records to ensure that we have reserved one for you. That is it!

Congratulations on winning a free Apple iPad (valued at $800). In case you have any question or concerns, feel free to email me back. However, you need to claim your free iPad first to ensure one will be set-aside for you before the deadline ends. We do understand that you may well not receive this email until after the deadline, but, we suggest you check out the website and enter your email to see if we still have got yours on hold, which we often-times do because others have not claimed theirs in time.

Gerald Darr
CEO, Craigslist

Edited on 1/5/11:

Thanks everyone for reporting your information in the comments.  Here is the information gathered.

Names used by these scammers:

Gerald Darr
Cliff Halliday – reported by Tiffny
Curtis Timothy – reported by ari
Curtis Smith – reported by Janet
Herman Fischer – reported on the consumerist
Mark Osborn – reported on akronwebdevelopment