Engadget posted an Apple iMac hands-on with two additional 30-inch displays

One Thunderbolt port on your new MacBook Pro? Pah. The new 27-inch iMac has twice that many -- two. When we got ours out of the box we just had to do the natural thing: fire up as many pixels as possible. Two 30-inch Dell displays and a couple of dual-link DVI display adapters later and we have what you see above: a wide swath of LCD covering covering 11,878,400 pixels. Sure, any average desktop can do this, but how many all-in-ones can push that many dots? The iMac's 27-inch, 2,560 x 1,440, LED-backlit IPS panel is definitely a highlight, but flanked by another two monsters the combination is, honestly, a little overwhelming. We tried working this way but only made it about 30 minutes before retreating to smaller fields of view.

  Apple iMac hands-on, with dual 30-inch displays