Homebrew PCBs

Hi folks. I was just looking at some of the boards in the 
photo/files area and i must say thats very good work. None of my 
homebrewed boards came out as good as those.
 I was just wondering , How narrow can a trace be etched in a 
homebrewed board? I'd like to know if anyone has tried running a 
trace between the pins of an IC. The reason i ask this is because 
there are times when the only solution to running a trace(s) is to 
route them between the pads for the IC pins, can this be done?



Net.