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[SmileyMan]

Can anyone please explain, when using the SDL version of DF2010, which of the graphics options in the init.txt file are actually useful?  Do I need to turn "GRAPHICS:ON" for instance, to actually use SDL, or is it being used by default?

The comments in the init file seem more to pertain the the old OpenGL engine rather than the new one.

[Thief^]

GRAPHICS:ON enables using a graphics set (for creature graphics). It's independent of SDL.

SDL is always used for setting up the window and for input (except for PRINT_MODE:TEXT (linux only), which runs as a console app), and is used for rendering in PRINT_MODE:2D and PRINT_MODE:2DASYNC. PRINT_MODE:STANDARD, :ACCUM_BUFFER, :FRAME_BUFFER and :VBO all use opengl for actual rendering. No idea about :PARTIAL, it's either based on :STANDARD or :2D.

[SmileyMan]

GRAPHICS:ON enables using a graphics set (for creature graphics). It's independent of SDL.

SDL is always used for setting up the window and for input (except for PRINT_MODE:TEXT (linux only), which runs as a console app), and is used for rendering in PRINT_MODE:2D and PRINT_MODE:2DASYNC. PRINT_MODE:STANDARD, :ACCUM_BUFFER, :FRAME_BUFFER and :VBO all use opengl for actual rendering. No idea about :PARTIAL, it's either based on :STANDARD or :2D.

So if I have a decent card with up-to-date OpenGL drivers, should I be using one of those other modes as well?  Or is SDL running as 2D the best bet?

[Thief^]

The comment in the init file says that :STANDARD should be a could blend of speed and reliability. It used to be the default option, too. It's almost always faster than 2D mode.
The other options you'll have to try.