Multi Projector Setup Has anybody had experience with Multi Projector setups? I've been looking around and run across several options:


Watchout
Wings
Millumin
Pandoras Box
Christie Projectors  


The only type of presenting I've done is with a single Panasonic PT-D6000US, we want to branchout and do a really wide screen show. It will not be for a live performance (it seems like that is a big feature with most of those applications).
There isn't a need for 3D mapping, the projectors will be mounted above the screen, so we'll need to correct for distortion. We'll have a curved screen, and will need some sort of triggering system, whether it is a motion sensor, sound or light sensor or just a button that can be pushed. So the question is, what is the most cost effective simple multi-projector setup.

Thanks in advance for any advice!
Depending on your needs, it might be as simple as using the drivers that come with your system.  I know that certain NVidia cards can make multiple video outputs appear as one single screen to Windows.  In a case like that, it would simply be a matter or properly aligning the projectors (if they can handle the key-stoning themselves)  A lens might be able to handle correcting for the curve.