Thanks everyone for your comments.
greenlig: Oh much so, z-brush has some new plugins that are quite nice, but when it comes to workflow mudbox is kicking z-brush'es arse real bad. Once Mudbox is released, z-brush will have to go though some changes if its to grab its audience. Mudbox's interface is much like any other 3D modelling package such as 3Dsmax/maya/XSI which makes it familliar to the 3D modeller.. I also found it to be a lot faster, and to make use of my computer's resources. I can easly run it at the same time as XSI, PainterXI and OpenCanvas with no slowdown what-so-ever. Its only in Beta yet though, so people need to apply for a beta release to try it out.