Sounds like you have a glossy screen, my Matte screen
works perfect in all conditions even with the sun on
it coming from behind me i can see everything.
If you have a glossy screen there is nothing you can
do.
I just got a Macbook Pro 2.16G with glossy display yesterday evening. I wanted a matte one, that's what i'm used to with my powerbook and have been very happy with it. I think the glossy display colors and resolution look beautiful but i was worried about glare on the screen.
But the Apple store had two open box MBPs, bought and returned unused by other customers, which I could get for $200 less than the regular price, as new with full warranty, and they were both glossy. So i decided to get a glossy one. I started it up and looked at it before leaving the store, it's perfect, the accessories were still in shrink wrap.
Happily i noticed last night in my usual chair, there was no glare whatsoever. It looked the same as the powerbook. There was a little subtle glare in the bedroom when i took it to bed on one corner of the display, but not distracting me. Given the choice, i would now choose a glossy one.
Anyway, this thread caught my eye and after reading it, i took the MBP into the backyard. There's lots of sun, it's exactly noon right now. I tried it in the shade, indirect sun, and with sun shining directly on it. The display has great visibility for text, very sharp, no problem under any conditions. I was surprised at how good it is.
I compared it to the powerbook, the glossy display has more contrast, it's sharper. But hard to compare because the powerbook is smaller. The powerbook was ok for text. The colors on both computers are darker in the sun, but i didn't have any trouble seeing anything that was there, nothing was faded out and obscured, just a little darker. The colors are still distinctive, they aren't faded out. It looks normal in the shade.
I think the glossy display is supposed to have sharper contrast than the matte. But i still would've expected more difficulty based on experience with other LCDs, like my Palm TX and Razr, forget it.