Although it already has its thread here, I wanted to present you another way of using the script Point Cloud Skinner v0.14, so I created a new thread here.
As you can see in that previous thread, the script will be often used to skin a point cloud, but here is another example explaining that you can use it to connect two different pieces of 3D mesh into one smoothly.
Using this idea, I connected two types of sphere that Blender originally has, which are UVsphere and Icosphere. Because each sphere has completely different configuration of vertices, it might be difficult to connect the two, however you can do it easily using the script.
Here is the result mesh:
Video of how to connect two spheres of UVsphere and Icosphere using the script Point Cloud Skinner v0.14:
YouTube HD Part1/2: 
YouTube HD Part2/2: 
Video of how to connect two meshes of decimated suzanne and original one using the script Point Cloud Skinner v0.14:
Vimeo HD: 
The source .blend file:
86 49 ConnectTwoSphere Pub20100131.blend
I hope this helps you especially when you want to connect two meshes.