A brief search of my favorite free-ware help site got me to this forum entry:
http://www.techsupportalert.com/content/scan-multi-page-pdf.htm
Possibly a couple ideas there.

A little googling got me here:
http://www.snapfiles.com/get/scan2pdf.html

Only have the 5 user reviews to go on if it's ok...
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10101311 (20GB- backup empeg)
10101466 (2x60GB, Eutronix/GreenLights Blue) (Stolen!)