I'm using Acme for web devel. Yields very well to scripting. Together with plumber and a few scripts, it provides pretty much a complete IDE. The ability to simply click on any text to 1) execute it or 2) search for it or 3) copy/paste/replace is something that I miss from other editors. Essentially, any text becomes hypertext. Output from compiler or debugger links you to source files etc.

Aside of that there's a big chunk of remote filesystem access ported from Plan 9, but I haven't used that yet.

Acme is, in fact, a modern, windowing terminal -- it lets you view, edit, execute and navigate. No surprise given that it comes from Rob Pike -- one of the guys behind an earlier windowing terminal: http://en.wikipedia.org/wiki/Blit_(computer_terminal) http://doc.cat-v.org/bell_labs/blit/

http://swtch.com/plan9port/ is quite easy to start with on any POSIX system.