IPv6 support, option to reopen file if trying to edit a file already being edited...
New in v3.1.x: New socket event handling system and performance improvements for local directory tree (v3.1.3); IPv6 support, option to reopen file if trying to edit a file already being edited; Release Notes - Last Updated: 10.09.08 (v3.1.3.1 / v3.1.4 RC1)
Pros: Fast, reliable, and free; easy to configure and easy to use; solid set of features
Cons: A bit shallow perhaps, but the icons could be prettier (or at least more intuitive)