Two is a beginning, but you really do need three for optimum efficiency :) Three's good, four is too much: http://improve.dk/blog/2006/11/29/multi-monitoring-with-style

I've got three at work, and I love it! A Dell 30 inch in the center, flagged by two 19 inch monitors. I keep email up on the left monitor, my IDE in the middle (30 inch) monitor, and instant messenger, documentation on the right monitor!

Wow, 30"? I have the dual 19" monitors at work and a single 24" at home. I run the 24" at 1900 x 1200, so I usually have plenty of work area, but I'm definitely more efficient with the dual monitors, at work. I think dual 19" monitors on either side of my 24" would be ideal.

I've got dual 20" monitors and a 17" CRT for color / size testing purposes. Plenty of space to work and test. Newegg is a great place for monitors btw...

When we first got the 30's in at the office, we (the devs) were all thinking maybe they were just a bit to big. I seriously considered giving one of my 19's away. But my experience turned out to be a lot like when I got dual monitors back in the late 90's... You very quickly adjust to the amount of space you now have, and then you wonder how you ever got along without all that space before.

The ONLY downside of having the 30 inch (other than the crappy ATI drives for my T60P) is because I have a laptop, with a much smaller screen (both physically, and pixel wise), and visual studio has no profile support (that I've found); I can't customize how I'd like to be able to given the amount of real-estate I have at work.

i.e. I'd like to keep the toolbox and server explorer open permanently when I'm at the office, and have my laptop docked, but when I'm undocked, I'd like to have that stuff closed, and have it all happen automagically.

Who knows, I may decided to write a macro to make that all happen...

We are waiting for the era that the developer will have his own 9 monitors like swrod fish movie:D.
I like the Idea and I am sure I am one of those who need minimum two monitors.

Can you install a third monitor with a DVI or VGA splitter? I am using both slots with my current monitors and would like to hook up another monitor without having to install a second video card.

kbeeveer46, not that I've ever heard of. If you don't want to install a second video card, you can get a USB to VGA adapter. Thats how I feed my third monitor at work. You only get in the neighborhood of 5-8 frames / second on it, but it works sufficiently for email or documentation.

Sewell has a USB to DVI for $150 (http://sewelldirect.com/USB-to-DVI-External-Video-Card-High-Resolution.asp). The USB to VGA I have ran $100, and I think we ordered it off Amazon.

HTH