I'm trying to use Inkscape to replace Corel Draw 10, which won't run under Windows 7. Although I have a 64-bit OS, I'm using the 32-bit version of Inkscape as the UI of the 64-bit version is (for me) unusable. As a trial, I over-traced a bitmap part cut-away mono line drawing of a centrifugal pump and applied suitable fills. FWIW, I suspect that this is almost on the limit for my desktop machine (2 x Xeon 2.33 GHz processors and 4GB RAM with a GeForce 8400GS video card) as it was starting to get fairly slow to refresh. Interestingly, Inkscape runs much smoother under Ubuntu 12.04 on my laptop (Core 2 Duo with 4GB RAM). Overall, I'm very impressed with Inkscape - congrats to the developers!
Anyway, the result (exported at 150 dpi):

(Edited to change URL of image because Deviant Art copy wasn't working)