Grease Pencil...

[andylegate]

I found out how to do that by accident.....was too sheepish to mention it way back when.....

[GPNMilano]

Also, another way to fill in the gaps is to select one of the vertices (the one you wish to remain where it is) and press shift S choose the option "Cursor to Selection" then select the vertex you wish to move and press shift s again, this time choosing "Selection to Cursor" this will cause the vertices to snap together, at which point you can just remove the double, and it will join the two edges into one single one.

[Jojon]

..and alt-M will merge all selected vertices. A pop-up menu will let you choose where the resulting single vertex will wind up.

< joining the disorienting hotkey flood :D >

[Chacal]

alt-M is what I use.

[Grogyan]

I saw a video, which I can't find, and was going to see if there was a plugin that did the same thing.
I can't remember what the method was called, but it was just like draw a circle and it balloons out, what is that called?
Parametric,
Volumetric,
Pantogram
or another name?

[Chacal]

Wow! This is such a great feature! I can make meshes now in minutes that used to take me hours! So easy to use too!

Now imagine using it with this interface...

[J'Kla]

Ahh but the Blender grease pencil gives a lot more per dollar.

[Grogyan]

I found the article I was referring to, it is a modelling program called Teddy
http://www-ui.is.s.u-tokyo.ac.jp/~takeo ... teddy.html