As anyone who's using the K3 Epsons (2400, 3800 etc) for printing b&w knows, the documentation on using the ABW (Advanced Black and White) mode is sparse to say the least...

I recently came across this (there are several sections)

http://www.outbackphoto.com/printing....html#20070103

Although it's for the 3800, a lot of it seems to apply to the other printers too.

Stacks of technical info and measurements, but some useful conclusions too. A few pointers:

Don't print through ABW using RGB files with "colour" in them. Use greyscale.

Printing with ABW is generally better then using RGB files printed via one of the standard colour profiles - ABW is much more linear than most of the profiles, gives a blacker black and also seems to use less yellow (though doesn't seem to do away with it altogether)

"Dark" is the best standard setting under ABW (and he explains what some of the other settings do)