When most of us talk about desktop replacement notebooks, we generally turn our eyes to the notebooks from Alienware, Eurocom, Hypersonic, and Voodoo. Widescreen 15.4" notebooks with desktop P4s, P4 EEs, and A64s are the "norm" of this group, it seems lately. This is a bit in contrast to some of the earlier DTRs that used Centrino technology as the basis for a platform (i.e. Dell's Inspiron 8600).
While we should be reviewing more DTRs of the first group, a Centrino DTR is something refreshing, since it allows for a slimmer, thinner, and lighter profile mobile system. Desktop replacement notebooks that use desktop components are normally mobile in the sense that you move it from one desk to another to use. They aren't exactly systems that sit well in an airplane or in your lap (though, a few people seem to have a knack for adapting).
Desktop replacements that use Centrino parts, on the other hand, take up a smaller real estate profile compared to their big brothers, due to the size of the components and thermal emissions, and allow for a much leaner desktop replacement. Acer did just that with the Aspire 2020, a lightweight 15.4" widescreen desktop replacement notebook.