Have Neil wear one (or have them available, at least) at the upcoming ALA Annual Conference where, I'm under the impression, Neil will be to pick up his Newbery medal.

send out some of the t-shirts to a chosen few, preferably of a certain reputation seen to hang out with @neilhimself like @amandapalmer, etc (oh and get Alan Moore to wear one, too) and have them wear the shirts on photoshoots.Oh,and send me one,too ;)I c

Initiating some type of clue-based treasure hunt (or a small scale Alternate Reality Game) would draw attention! And be AWESOME!

Libraries - sell enough above cost to be worth your while and let them mark up based on what the local market will bear.

Cafe Press... They are the best (sorry, the rhyme was unintentional). I always search there first.

Ideas: 1) My cat themed book blog! 2) icanhascheezburger.com/ 3) The cats who twitter blog 4) pet stores 5) Bookcrossing.com 6) GoodReads.com

Book stores...(independant and otherwise)if you have a marketing budget at all the big-chain book stores would ask for a set-up (display) charge (fee)...

Get Stephen Fry to re-tweet it! ;)

Also, a Facebook add would be great. Ooo! You could do a blog contest and have people advertise on their blogs for you for a chance to win a poster.

I would definitely advertise in all of the library journals. Librarians would eat this up! I should know!

Oh how about dressing up a dog as a cat and take pics of him/her as an ad and post it up all over the place

or make a little video with sock puppet cats and post it up everywhere Coraline/Neil/Cat related

going on my rss feed: fantasy sites: tor.com, locusmag.com, io9.com. obvious: Mr. Gaiman's site, Comic Con, after the Coraline musical, plus anywhere Neil goes.

Or bombard many blogs with a picture of a cat wearing a sign that says "BUY MY SHIRT AT NEVERWEAR.COM"

you should market it on icanhascheezburger.com :)

And is it too obvious to say Twitter the new design with the tag #cats?

Sadly you missed 'World Cat Congress' in March. But there's always next year. Feel like a trip to Melbourne, Australia? http://www.worldcatcongress.org/wp/am_next.html

I think you should do a video that ties in with the current Youtube phenomenon that is 'play him off, Keyboard Cat', but maybe with a 'play him IN' twist.

Indie movie theaters, bookstores as well - Landmark, Reel Pizza - have postcards/flyers that can be posted in the lobby.

hmm...sell it on Cafepress? sell it on a cat rescue website?