Comment 1 for bug 672019

Objects in Inkscape do not snap to full pixel values by themselves: you have to take care of this yourself, if it matters (e.g. by snapping to grid -- using a second grid offset by half a pixel, or snapping the bounding box instead of the nodes to the default grid):
<http://wiki.inkscape.org/wiki/index.php/FAQ#How_to_suppress_antialiasing.3F>

Inkscape now includes the 'Pixelsnap' extension (Extensions > Modify Path) which allows to adjust objects to avoid anti-aliasing effects when exporting to bitmap (doesn't work for text objects):
<http://code.google.com/p/pixelsnap/>