I'm thinking Big N should have just used one big screw instead of two. I think I'll loosen those just a tiny bit to take off some strain, but if I'm wrong could make the entire thing worse. No cracks there yet for me, but it is a scary and unerving thought this can happen to any DS Lite imo. Instead of sending it to Nintendo, and paying 50$ (voided my warranty already xD) I'll hold out till DS Lite replacement shells come out, and maybe change my bland white to a two toned black and white. Maybe if I can just remove the top screen without any damage to those blasted rubber pads hiding the screws I can loosen the lock hing up somehow... Hmmm... I think I'll go try.
EDIT:
I just succesfully taken apart my DS Lite with minimal damage (I hope). The left hinge crack doesn't seem to be caused by stress by the user or anything of the sort. Within the left hinge is a short metal tube, that seems to be able to expand. I think due to natural nature of this, the tube is slightly expanding, maybe caused by temperatures and such. Might be interesting to see a geographic display of where most of the cracks are occuring in North America (a hunch is closer to the equator). We might not be hearing cracks happening frequently in Japan and Europe because they're further north than NA is, just a theory relating to weather. As for the right hinge, the friggin locking mechanism is so tight, when I isolated it, took a lot to just change it to one position, I'm trying to figure out a way to loosen this right now, and its midnight... must sleep soon.
EDIT:
I took that metal tube out of the left hinge, and I am almost 100% certain this causes the crack now. Once I took it out, the crack went back to looking like a hairline crack compared to what it was at first. This to me tells me that this metal tube is the cause of the crack in the left hinge. The tube isn't whole, it has a gap straight through it vertically (when oriented with both holes top and bottom). right now I just "squeezed" it and closed the gap and overlapped the tubing a little (had to straighten it out so it was round again). Once I did this I fitted it back into there it belongs, and it went in a lot looser than it was before. Now I put my DS Lite back together, and the left hinge is lose, but the crack isn't as large as it was before (before I did this the crack was about 0.5 mm wide [like seen on pictures posted where the crack was apparent] now the crack has a hairline appearance). As for the right hinge, I was unable to modify the tightness of the locking mechnism. The spring Nintendo used inside the locking mechnism looks like a very thick gauge, it's very hard to "unlock" it when it is isolated. Anyways it is 1:20 AM here, I am off to bed. I hope this information proves useful to some. Also someone had made an observation that the hinges were too tight, they're pretty much correct, that tubing made the hinge tight, not only that it was most likely expanding just due to how it was situated with a gap.