What is the best, safe way to sell an almost new Mac?

The "Mac used marketplace" is no different than any other brand of computers, cept macs fetch top dollar for faaaaaar longer than their windows counterparts. Newish, you're going to take a big hit. Just like a car, you lose a bunch the second you drive off the lot. Be sure to check Apple's refurb section to be sure you're not asking for more than buyers could get the same hardware straight from the source or you're not going to get much interest.

Craigslist is the safest way to do it. I always hear people complain about the bogus buyers and low-ball offers, but you just have to ignore them. They certainly don't make it difficult to spot them. Just ignore.

eBay can work too, but personally I've always preferred to take a $100 or so less than what eBay's going for and dealt with people local and in cash. Sold 3 laptops via craigslist and the only problem I had was some dumb chick trying to stiff me out of $50 after we already agreed to a price. I sent her "back to the ATM" (I'm sure it was just in her car) and all was well.

Oh, and the "used mac" sites like Macofalltrades are going to give you a fraction of what your Mac is actually worth. They need to be able to mark it up and make money off of your laziness.

These two websites are safe places to sell your Macbook.

I hope you have good luck!

http://www.usedmac.com/

http://www.macofalltrades.com/