When shooting a landscape or other photo where you want a deep DOF, I know a narrow aperature is essential, but where's the best place to focus before shooting? The foreground, background...somewhere in the middle? I find this especially difficult to figure out when there's something in the extream foreground that i want to be atleast somewhat in focus, but I still want a good DOF for the things in the background. Any help with this would be great! :)
Thanks!
-Wintery

I sometimes cheat and do a double exposure with differing focal points on a tripod - either that or shoot at F22 and focus about a third of the way into the distance if there is a sufficiently good and interesting focal point.

If there's something that naturally draws attention within a scene, I will focus on that, even if it's in the extreme foreground. If nothing stands out I'll tend to fire off a few shots with different focus points and see what works. Another technique i've read about is to focus a third of the way into the scene.
Hope this helps, i don't think there's a defintive answer apart from experimenting to see what works.........

More information

I don't know about your camera but mine has a depth of field preview button. If you hold that it will stop down your lens so you can see what it will look like. Sometimes it is still hard to tell though. The other advice is good above aswel.

Thanks for all the great responses. My camera does indeed have a DOF preview button, but at very narrow aperatures, it's pretty dim in there. Good info to help with my experimenting. Thanks again.

ya, that is part of the reason why it is sometimes hard to tell with the preview button.