Hey mdhiggenz.

x^2 + y^2 = 2x gives

x^2 - 2x + y^2 = 0 or

(x-y)^2 = 0

I'm a bit unsure on how this is a cylinder: Usually a cylinder (axis-aligned) is x^2 + y^2 = r^2 with z varying if running along the z-axis.

I might be misinterpreting your post though.