New Toy!

[Alex]

Essentially it still means the same thing but functionally the key difference in a Digital SLR is that the lens body is mounted and removable where non-SLR cameras all use fixed-body lenses.

There is still a technological value to a mirror SLR over simply using LCDs to compose the image. That benefit is in focusing. No camera-back LCD currently on market (and definitely no view-finder LCD) offers sufficient resolution for accurate focusing.

Finally, the digital SLRs on market now all offer a significant improvement of image quality at the same resolution since they CCDs inside the cameras are larger than the ones inside small digital cameras. Also, the optics of even the standard lenses tend to be better than the micro-lenses found on most standard digital cameras.

So in the digital age "SLR" is essentially a catch-all term for a bundle of features common to SLRs that aren't necessarily dependent on the actual SLR mechanism. There are a few manufacturers of prosumer digital cameras that have interchangeable lenses but do not actually use an SLR mirror.