My advice would be to set up a Tell Tale Games myspace page with sam & max listed as one of the major titles.
Myspace is used for everything but primarily it is a meat market for people to meet each other and date. However most people who use it have become addicted to it, so it's now being used for advertising of just about anything you can think of.
My wife uses myspace to keep in touch with some traveling nurses that she is friends with. I choose not to use it, but I hop on over once in a while to read Ryan Reynold's (Just Friends movie Star) blog.
http://www.myspace.com/ryanrodney That dude is hilarious. hehe.
Most recently the Nightmare Before Christmas (3d release) is running an exclusive myspace contest where they give you the chance to design your own Nightmare Before Christmas character. If you win you get a personal greeting from Tim Burton to put on your myspace.com page. (This is really quite cool, especially if you're a Tim Burton fan.) ---
http://myspace.com/nightmare3d
These are just a couple of things myspace is used for. And with literally over a million users of Myspac e (and even more visitors) you will be sure to reach at least a few "new" people to adventure games.
I have to warn you though that a lot of myspace users seem to be of the ADHD generation. So I don't know how many converts you'd get. Still, it's really cheap advertising. If you sold an extra 5-10 copies, it'd probably be worth the time to set up the initial site, and then after that, cost wise, it's mostly gravey, just assign someone to update the content when it needs updating, run a contest now and again, send out a few mailings, etc and it will generate some more business for sure.
I was actually wondering just the other day how long it would take someone to throw something funny into their game/animation about Myspace. (actually my wife brought it up for a claymation project we're working on together, but it translated over nicely. hehe.)
I'd also suggest that you have someone do a regular blog on the myspace site as well. You guys, as a small company, need to get really creative with how you get the word out about your products so you can reach a much wider audience.
And if Telltale ever wanted to make an adventure game out of Jack Skellington's world, I'm sure it'd be quite popular. hehe
I see no reason why TellTale couldn't have a myspace page up as well. You might even garner a bit more support by running some exclusive myspace contests.