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Sony's Xperia S have 338 PPI which is even more dense than Apples "retina display". So there are other companies using high dpi displays. Galaxy Nexus is at 316 PPI if I remember it correctly. HTC has a phone, Vigor, that has 342 PPI. So apple is certainly not the only company out there who likes pixels :)

Samsung builds the Galaxy Nexus, which has a 316 ppi display.

Now, we still have a way to go before high ppi displays are ubiquitous, but there you have one example at least :)

The Galaxy Nexus uses pentile subpixel rendering, which is a system with slightly controversial ways of determining the PPI.

HTC One X comes to mind (first and only one I looked up), 310-320 DPI (depending on the source; first few hits on Google)