I use a L-shape table that I bought from Ikea and a 4-monitor arm to hold 4 19-inch monitors. The monitors are too heavy that the table breaks. do you guys use a wooden table? is your table having problems with the monitor weight?
Hard wood. From IKEA also. About 3/4'' tick. 3 x 22'' LCD + several books and one laptop. No problem. It could also hold some CRT I think.
I use the IKEA GALANT (http://www.ikea.com/us/en/catalog/products/S79807617) and have had no problems - but I just use a freestanding mount. I could see that using a stand that mounts to the edge would be a problem and break the wood.
I bought a desk from these guys. http://www.versatables.com/pages/products/school/cd7230.php They are very sturdy and nice looking.