I've never attempted to sell a anthology or any other type of book so these could be horrible ideas!

Pre-Orders:

Since you'll be sending out ARC's as review copies it would be good to have the anthology available for pre-order so that when the early reviews come out people will be able to go right from their to order, and not have that delay until it is actually released. Anything that makes the readers wait to push that buy button is just one more reason to not do it.

Blog Tours:

I have seen several authors these days going around to different blogs that cover the genre their work falls in and setting it up so they have a quick post show up promoting the work in several place over a set amount of time to keep the momentum rolling.

Project Wondeful advertisements:
I've seen on several sights that you can advertise on them using project wonderful. Some of these are as cheap as a few cents a day, and even pro-zines and the like use them. FlashFictionOnline, a professional market according to SFWA, has several areas available for cheap. Pats fantasy hotlist is another one that comes to mind.


ARC give-aways:
Many forums, which I assume would include RAFO, enjoy doing give-away contests to promote themselves. This also helps promote the work by getting the word out. Sending them a few copies to give away is a win win for everyone!

Excerpts:

Make one of the stories, or even a portion of one, available for readers to check out so they can see if they would enjoy more. You can use this to draw more traffic to the book and the free part will at least get people looking. Then when the anthology comes out they'll be willing to pay for the whole thing. Hey, it works for drug dealers right?

Interviews:

Having the editors of the anthology do interviews is a great way to let people know about the work. Another good thing to do is to ask the individual contributing authors to mention the anthology if they get a chance to when doing their own interviews. The more people you can get talking about it the better.

Forums:

Many forums have an area where they allow people to post anouncements, which allows you to /nssp your work without coming off as spaming or being rude. Plus you can do more then just one post as long as you have a good reason and incentive to keep everyone interested. So an announcement for it being available for pre-order, released, high-profile interviews, and awards are all good reasons. Make sure to include a note about your free excerpt and a link to the site where it's found. Then make sure that pre-order/buy button is at the end of that excertp.

Reviews:

In my opinion there are two types of reviews. There are those reviews that a reader can use to tell if the work is similar to their past tastes in reading material. Then there are those reviews that are just out there to get the word out more, even if the average reader of that review probably won't buy it.

Both can be useful as they provided comments and endorsements that you can use, but making a list of the reviewers and then tracking the results is a good idea to know when enough is enough so you don't end up wasting time and money.

The idea purpose of getting a reviews in my eyes is making your work popular enough that reviewers will actively begin to seek out the work on their own and post their own reviews without prompting.

Writing websites:

For anthologies and short stories I've always found one of the largest target markets is writers. They have a vested interest in the form and usually will be more willing to give those less publicized works a try. Many novice writers will buy anthologies when first starting out just to examine different writing styles and methods.

I hope some of this helps!