perspective drawing is to project world like in real life, for example, if you are standing closer to a house, it is bigger, but if you stand far away, it will seem smaller and the things closer to you will seem bigger.
isometric drawing is to draw something that is 3-Dimensional such as cubes of blocks. It is not the same as perspective as for perspective it will seem smaller the further away it is unlike the isometrical drawings which is a bit mathematical.
Oblique drawing can produce 2-Dimensional images of 3-Dimensional objects. It projects an image by intersecting parallel rays, for a tunnel.
Orthographic drawing is a drawing which has a view of only one side of an object, either top, side, front or back.
sources: http://en.wikipedia.org/wiki/Oblique_projection
http://en.wikipedia.org/wiki/Isometric_projection
http://www.artic.edu/aic/education/sciarttech/2d1.html
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