I am typing this on a wireless iBook laptop connected to my house through an AirPort base station (oh yeah, 3 dots baby, go go gadget go!), and it occurs to me that even though the brightness is turned up all the way, it's still hard to see the screen. If you find yourself in a similar situation, here are a few tips for you. (OS 9 of course; but I suspect there are parallel functions in OS X. Actually I know there are.)

While you're banging on the F2 key to increase the brightness, hold down the option key and the Monitors control panel will magically open.

I turned the Gamma all the way down, which lightened (not brightened, lightened) the screen considerably. Dark lines such as text and window borders are still black, though, so it became instantly easier to read - at least in the shade where I am sitting.

Here are my exact settings:

Native Gamma: 2.2
Target Gamma: 1.00
Chromaticity: didn't change
Target White Point: 6000 K

Your settings may be different depending on the exact angle of the sun, the color of your house, the type of grass you are growing in your back yard (bluegrass, fescue, or in my case, nonnative California Oat Grass Weed), and the color of your shirt; then again, maybe you just don't care.

Happy outdoor computing!

P.S. Turn AirPort, AppleTalk, and File Sharing off to extend battery life when not connected. But you probably already knew that.