There used to be a device that you could attach to an HP LaserJet. 
You hooked a telephone line into this stand-alone small black box and
then you could receive incoming faxes on the printer - so your printer
became an inbound fax machine.  I want to buy something that does
this.  Where?  - Todd

Hello.

The product that you remember is HP's PrinterPal.
"The HP PrinterPal is a small, pocket-sized fax accessory that plugs
into the parallel port of HP LaserJet or HP Deskjet printers. Once
connected to a power source and a regular telephone line, it will
receive and print faxes on the printer."
http://www.hp.com/cgi-bin/cposupport/get_doc.pl?SNI=prpallj&LC=faxes&Tfile=bpf01315

Apparently, the product is no longer made. Quite a few of them seem to
pop up on eBay, though. Two were PrinterPals sold on eBay in just the
last week:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2300977280&category=25315
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2300226530&category=1246

If you don't want to wait until the next eBay auction for PrinterPal,
Syntran's FaxPrint device  does the same thing.
"SYNTRAN's FaxPrint allows you to print faxes directly to your printer
without the use of your computer. Using your computer as a fax
receiver can cause unnecessary wear. So just connect your phone line
and printer to the FaxPrint and you're ready to receive faxes
immediately."
Source: granitedata.com:
http://www.granitedata.com/syntran/faxprint.html

Two reviews of the product are these granitedata web pages:
http://www.granitedata.com/syntran/news.html#news10
http://www.granitedata.com/syntran/news.html#news17

An online retailer called sohomax.com is listing FaxPrint for 74.95:
http://www.sohomax.com/faxprint.html

search strategy: printer "into a fax machine"

I hope this helps.

Fast, timely, I have been searching, to no avail, on the web for a few
days looking for this answer.  Good Job!