OpenGL...optimizations?

I was wondering what some optimizations there are for OpenGL?
I know about Octrees and far clipping, but are there any others?
Also what is a good far clipping distance?

any help will be very much appreciated,
-psychopath

>> I was wondering what some optimizations there are for OpenGL?
display lists, vertex arrays, google, etc...

>> I know about Octrees and far clipping, but are there any others?
These are algorithms for graphics in general, they're not specific to OpenGL. In addition to those frustum culling comes to mind, backface culling, LOD rendering, the list goes on forever depending on what your doing specifically.

>> Also what is a good far clipping distance?
This really depends on the scale at which your rendering. Theres no single value thats better than another.

ok, thanks, this helps....or at least has me thinking again

-psychopath

I read the thread title and though you meant video card specific extentions which opengl does support