Homebrew PCBs

My first good etched board was the result of great advice from this 
group. Now, my first good double sided board has been made - again, 
thanks to advice from this group!

I printed two transparancies (top mirrored) with two registration 
holes along the bottom. I used an old piece of PCB with a nice 
straight edge and butted a good un-exposed PCB up against it. Then I 
placed the top transparancy so that it was basically square with the 
new board and taped it to the scrap piece.

Out comes my center punch - carefully tap the two registration 
holes, then drill a tiny hole right through both spots (the width of 
a resistor lead). This lets me poke a couple resistors through the 
holes to get proper alignment.

Now I flip over the whole mess and grab the bottom transparancy. I 
poke holes (carefully) where the registration marks are and line 
those up with the holes I drilled in the new PCB - then poke the 
resistors through. Once it looks good, I tape the transparancy to 
the old PCB.

Now I have have something that (sorta) looks like a two-page book. I 
peel off one side of the protective film, line up the holes by 
poking resistors into them, cover with glass and expose (after I 
pull the resistors back out of course). When thats done, flip it 
over, peel the second side and repeat the above.

After developing (flipping it every 10 seconds or so) and etching 
(flipping half way through), I have a PERFECT double sided board. 
Well, perfect except for the fact that I goofed in my layout and 
have to figure out how to solder underneath a coin cell holder :D

Thanks much everyone for all the great information on this board!