I don't know if there is a better "FREE" PDF to DWG or (better yet) PDF to vector program out there, but I have just started using PDF to Vector v2.0 from
http://www.verypdf.com
http://www.verydoc.com/pdf-to-vector.html
or
http://www.verydoc.com/pdf-to-dwg-dxf.html if you want polylines.
See all of the downloads (including DWG to image) at:
http://www.verydoc.com/download.html
The download is free and to the best of my knowledge, does not expire.
Basically this is a cmd line prompt program, but you can just rename your pdf file and place it within the folder you unzip the program.
I edited the test.bat file (right click and pick "edit") to limit the output to emf files only. (read the readme file)
PDF to Vector Converter (PDF2Vector) converts Acrobat PDF files into following file formats.
WMF Windows Metafile
EMF Microsoft Enhanced Metafile (32-bit)
PS Adobe PostScript file
EPS Adobe Encapsulated PostScript
SVG Scalable Vector Graphics
SWF Macromedia Flash File Format
XPS Microsoft XML Paper Specification
HPGL HP-GL plotter language
PCL HP Page Control Language, Printer Command Language Format (PCL)
PDF Acrobat PDF file, convert general PDF to Vector PDF
Open DataCAD and use the insert - Metafile - command. Place and resize as necessary (enlarge - cal dist)
The results were a converted pdf into actual lines, to scale and it even recognized much of the text as text.
This turned out to be much faster than tracing.
This is great, but is there another FREE program that is easier?