I'm using a todo tracker that I wrote last year in about two dozen lines
of shell scripts. It's not yet totally synced up to everything that it
needs to be for a full GTD workflow, but it has been a very useful capture
tool when the what to do next ideas happen faster than there is time to do them.

I've been using vi as my primary text editor for about a week and
relearning its charms. A bunch of writing has gone under source
control (using RCS for lack of any better idea) which is helping
checkpoint good ideas in progress. It's fun to write with a big font
and no interruptions.

>using RCS for lack of any better idea

Darcs may be a better idea for easy version control.

As for other terminal apps, try remind and wyrd for calendar/schedule handling. A great, fast, powerful combination.

Lately I've been absorbing vim shortcuts as well as experimenting with mutt, screen, and remind. Has a lot to recommend it, though as usual the more you put into it, the more you'll get out of it.

I use command line a lot in OS X. I originally got started because I was looking for a text editor that would let me work in full screen mode. Not "full screen except for menu bars, etc.", but FULL SCREEN. Through lots of experimentation, I arrived at replacing Apple's X11 window manager with one called Rat Poison (available through Fink).

Rat Poison is a window manager that ONLY works in full screen--every application you use under Rat Poison ONLY works full screen (then you switch between screens). Ultimately, I settled on using vim under Rat Poison. No menu bars, no iChat, just words on a blank page. Voila!

Going that route, there's also the ion window manager, which I tried out after compile errors with ratpoison. Pretty spiffy. Also in fink unstable.

Huh. Ion is kind of cool. The reason i went to rat poison was to try and beat down my ADD, but I'm gonna try ion for a while and see if I can resist the temptation to have a million tiles open on a screen.

Thanks.