We've been working on a PC board for a sensor, and unlike many boards, during this prototype phase we routinely have to change parts on the board. The parts are excruciatingly tiny, especially for aging eyes. The following picture (click to enlarge) is a dime with 5 resistors on it that we had to desolder from one of the boards:
And these are the large size resistors these days! They make discrete resistors that are 1/3 the size in each dimension.
For reference, the dime has about an 18mm diameter.
(Photograph by Rick Wight [http://isleowight.com/])