Most people probably wouldn't notice or really care about something like this, so what I'm about to say is just for gadget perfectionists who really scrutinize their devices. I already gave it away in the title and the photo above, but in case you want it spelled out: the Dell Streak's display is positioned a little off-centered beneath the (scratchable) Gorilla Glass. The bezel is about 4.2 millimeters wide on the left and about 3 millimeters wide on the right.
I can't think of another device that shares this horizontal alignment "issue" off the top of my head, but I know I've seen it before; it's not unique to the Streak.
I don't think the fact that the Streak isn't alone in this makes it okay, especially when the HTC EVO 4G and iPhone 4 sitting next to me have screens that are horizontally centered, but I'm not sure I'd go so far as to say that it's a design/manufacturing flaw. Of course now that I've pointed it out, it's going to be the only thing that some of you see; others will think it's just nitpicking.
Either way, I thought I should mention it at least as an FYI.