There is no means of scanning images directly into Inkscape.  I've asked for this feature at SourceForge...

http://sourceforge.net/tracker/index.php?func=detail&aid=1692006&group_id=93438&atid=604309

If all you want is a PDF version of a scanned image, then you could simply scan the image into GIMP and print to PDF (via cups-pdf or other PDF printer of your choice).

- Tony

----- Original Message ----
From: "anon trol" <anontrol@...155...>

Does anyone know if there's an easy way to grab an image with a scanner and
use inkscape to "save to PDF"?

...I'm moving to linux-vile and I'm jonesing for an Acrobat
Professional/Distiller "make pdf from scanner" replacement.

I don't even care if I have to convert raster data to vector data to do
it... just give me my fix!