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Versions of the LS series of engines have been in production since their introduction in the 97 model year Corvettes. In that time, millions of LS series engines have appeared in F-Bodys, Vettes, GTO's, CTS-V's, new G8 GT/GXP's, FWD Grand Prix's, Monte Carlos, Impalas, small block V8 GM full size pickups, full-size Sport Utes (Tahoe, Suburban, Yukon/XL, Escalade), mid-size Sport Utes (Trailblazer, Envoy). There are probably more models that I haven't mentioned here, not including those that have been retrofitted into classic muscle cars.
As far as why the displacement is large compared to Ford's mod-motor V8's, in simple terms, a naturally aspirated motor with large displacements make more horsepower at lower RPM's than naturally aspirated smaller displacement motors. To make another example with the S2000, peak horsepower is made at 7800 RPM's and it's torque peak is at 6800 RPM's. What it means is, unless you really rev it, it's a pig. On the other hand, the S2000 is a light car and the engine rev's really quick, so it happens to be alot of fun to scream around at 8000 RPM's in small doses or on an autocross track but you have to really be willing to work at keeping the rev's above 6000 RPM's. You have to heel and toe the gas and brake in turns to keep the rev's up, and in a daily driver, it can be tiresome if you're not a car dork.
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