Are there any free/open source programs that can rotate these inkscape "3D" objects,
particularly in an svg file? Could someone there make a good recommendation?

Are there any third part (free/open source) programs that support 3D rotation
of these inkscape 3D objects?

No, that was a typo: I only have Inkscape 0.48 in mind.

Is it at all possible to rotate inkscape 3D style objects, as described in my initial post,
through all 3 dimensions?

I am happily using inskcape 0.48 on 64 bit Windows 7. -Using /Extensions/Generate from Path/Extrude... /Extensions/Render/... I can do some 3d Object creation inside blender. - Is it possible to rotate these 3D objects inside Blender? - How do I do this? Is there some SVG viewer program out there, p...

I have been using the "draw bezier curves and straight lines" tool in inkscape, and have the following question. -Does inskscape have a rasterisation algorithm that can decompose a bezier curve into it component straight lines, their slope, length, position, and the anchor points? -Does th...

How may one alter parameters for the inkscape v.048 Spray object tool such that a variably diffuse version of the object is
painted, like an uber spray paint tool?

When run on Windows XPSP3, does Inkscape recognise all the Windows TrueTypeFonts,
located as ttf files in C:\Windows\Fonts\
?

How is it possible to drag and select a quadrilateral/irregular are for cut and copy,
the way non vector graphics programs do? Where is the "lassoo" icon for the cursor in inkscape?