I am trying to find the spin tool in Blender version 2.68. It's not on the left panel. Should I check something in the preferences?
Here is a screenshot:
Blender Stack Exchange is a question and answer site for people who use Blender to create 3D graphics, animations, or games. It only takes a minute to sign up.Sign up to join this community
The spin tool does not work with curves, it's specifically made for meshes. There aren't really any alternatives other than rotating around the 3D cursor.
To rotate around the 3D cursor:
Extrude e and rotate the curve.
Tweak the handles so it's curved:
If you don't care if the object is a curve you could convert it to a mesh (Altc) and work with it from there.
Found this here -- I think you need to convert the Bezier curve to a mesh (Alt+C --> Mesh from Curve), then Tab to enter Edit mode, then A to select all points, then you can use the Spin command. I'm in a similar boat as you, and this worked for me.