SciTE is like the Firefox of text editors - fast, cross platform, configurable, free / Open Source etc. with the bonus of giving a familiar environment on Linux and Windows, particularily where shortcuts are concerned. f you're used to editors like EditPlus or Ultra Edit on Windows, SciTE is at least as configurable (end of line chars, tabs / spaces etc.) and provides a source "tree view" allowing you to "collapse" functions / classes etc. plus has excellent code completion.

He goes on, talking about some of the smaller "nice" features that the editor has, including the source tree functionality. The one thing missing from this editor (as mentioned in the comments), is FTP support. I've said it before, and I'll say it again - the more connections you support, the better off you'll be. FTP is pretty much the only way that I use to work on my scripts - and it would be sorely missed were I to switch to another.