A few weeks ago I went through the process of etching PCBs using the toner transfer method.  It was fairly easy to acquire the materials, all I needed was some ferric chloride, a copper clad board, glossy photo paper, and acetone.  The circuit I chose to etch was a serial interface to a Morse code key and sounder, fairly simple but still useful.  The layout was done in Eagle CAD and transferred to a PDF for printing.  My university's color laser printer has heavy ink that transferred from the photo paper to the copper board really well.  I didn't use a heater or bubble stone during the etching process so it took about 15 minutes to eat away the excess copper.  The result was a nearly perfect single sided PCB.  If you're interested in making your own PCBs the toner transfer method is a cheap and easy way to start.