hmm... I haven't made a comment in a while but IE's layout engine, trident, has to be the worst engine ever. M$ never follows standards properly so a site, which could be made for any standard compliant browser in a short period of time will take like extra few hundreds of lines of code and hours of headaches/debugging just to get it to work on IE... especially when it comes to css, html dom and javascript... Also, IE's incapability of processing min and max widths and heights of elements has to be the lamest thing ever so I always have to keep a workaround template for this.
I wish M$ just stopped working on their browser and let organisations, which specialise in the web browser development to deal with the production of web browsers... or they should at least follow standards.
Until then, I'm for the standard compliant layout engines (which is basically all but IE's Trident):
Gecko (Firefox's engine)
Presto (Opera's engine)
Webkit (Safari's engine)
KHTML (Konqueror's engine)