Although my HTC EVO screen sunlight visibility photos showed that viewing angles are lacking in direct sunlight, they are actually quite good everywhere else.
Wide viewing angles may not be an important feature on a screen of this size but if you've seen my smartphone screen showdown on Pocketables where I compared the HTC HD2, iPhone 3GS, Nexus One, and Nokia N900 displays, then you'll understand that it can be a valuable quality for a screen to have. And rather than describe how impressive viewing angles are on the EVO (I can see why people could mistake the display for an AMOLED in this respect), I took a bunch of photos so those who don't have their own EVOs can get a better idea of what I'm talking about.
It's difficult to capture viewing angles accurately with a camera, but if you compare what you see below to what's in the screen showdown on Pocketables, you'll see that the EVO's screen really holds its own against the Nexus One (the "winner" in the viewing angles round).
Note: Colors looks better in person than in the photos.
Of course the screen looks best when viewed head-on, but I think it still looks pretty good from the sides, top, and bottom. There's none of that horrible "negative" effect that you see on some screens and the colors are still reasonably accurate, though obviously less saturated and sometimes too bright. Whites also tend to take on a slight yellowish hue from the sides (just like on the HTC HD2; same screen, I think), but at least they don't turn black the way the iPhone 3GS does when viewed from the left.
So if you don't have your HTC EVO yet, you can rest easy knowing that your friends will be able to see whatever you show them on the screen from just about any angle when you do.