I am excited today to finally be able to post my own topic in the Showcase forum. 
I have been following multitouch for almost a year now. 
Seeing and playing with cerupcat’s table last Spring really convinced me that I really wanted to build my own table.
I however wanted to do it on a budget and in a smaller form factor than most people here.
This is why I went with an LCD setup, as I couldn’t afford paying for a projector right now.
I also didnt want to worry about compliant surfaces and such, so I decided to go with a Front DI setup.  Well, I am more officially calling it what I think AlexP said: LED-LP, or Gap Method as described on the nuigroup wiki.

Here are the layers top to bottom:
=D LEDs
=Acrylic
=LCD
--Vellum/Backlight diffuser sheet
=Acrylic

The bottom piece of acrylic greatly increased the distance that the blobs would appear from even just one side railing of LEDs. 
I could have covered the whole display with only one rail of LEDs, but since it’s a DI setup I went with all the way around:

And a top lip to cover the LEDs:

And here is what it looks like so far:

The dimensions of the box is about 18x16x20 inches (lxwxh)

Still got some more stuff to do.  Will post pics of the blobs and such soon.
My new blog covers the whole building process step by step.  Check it out.

Really great stuff! I’m gonna have to stop by to see it sometime. It makes me want to build one. I’ve wanted a small one for a while though hehe.

A shot of the new tbeta on my table:

Blobs are working great!

Quick video showing the table in action using the Photo App here

Looks very nice! Congrats! Am interested to see that the height of your table is only 47cm, is that correct? (with a 17” screen)

Im looking into starting a project to make a coffee table multi-touch screen for my living room so I had thought the low height would definalty cause a problem with a projector and may also cause a problem for the camera to cover the whole screen, but this obviously hasnt seemed to cause a problem for you. Can I ask, do you think at that height of the table do you think that the camera would be able to cover a bigger LCD screen (i.e. 20” or slightly above?)

what does side DI mean?? Looks really cool. I notice your aren’t using a projector at all. How does that work?

Side DI is basically FTIR without the piece of acrylic to bounce the light around, but instead the LEDs shoot out across the top layer and hit your fingers.  It’s similar to LLP (with lasers) but instead uses LEDs.  Check out my blog link in my sig for a whole run down of my process, esp this page which explains some useful stuff:  http://peauproductions.blogspot.com/2008/10/mulittouch-table-prototyping-begins.html

How did you end up doing your back light on the LCD?

For now, it is the backlight out of the LCD, laying on the floor of my box, which is only 47cm or so away from the screen.  I took out one of the diffusers from the backlight, leaving the fresnel lenses and one of the remaining diffusers.  My camera is not officially mounted, nor is my power supply slimlined from a computer ATX power supply to a laptop charger, so both are lying ontop of the backlight, covering probably at least 1/3 of the total surface area of the light.  This though still produces bright enough light to work comfortably, though it can always be brighter.