I quite like Opera. It comes with really nice features, such as the allready mentuioned screen resizing, and recovery after crashes (lets you resume on the page you were visiting when your machine crashed). It's less resource-hogging, and quite faster then IE. It comes with some nice security options, such as letting you set up rules for cookies and deleting them when the browser closes. The only drawback i've found is that it does not support as mny plugins as the other two browsers, but in those rare occasions i just pull out old dusty IE.
