I finally finished my PCB layout with Eagle for my ARM Cortex M4-based VGA board and submitted the files for fabrication last night.

Got a response back from the PCB house that it does not meet their design rules.
Did a Design Rules Check (DRC) and sure enough, my traces off the chip were too close, even with 10 mil traces.

Turns out I used an SQFP package (0.4 mm pitch) instead of an LQFP package (0.5mm pitch). I would have been pretty mad with myself if they had gone ahead and printed the boards.

Thank goodness for DRC.

 

Glad you caught it. One thing I have come to trust is when getting parts for the breadboard make sure at least 1 of everything is left over. Then when I lay out the PCB I'll print it out one to one scale, and "populate" the paper PCB with the real parts.

A microscope helps see everything is going to be all right.

 

Glad you found it. You might find these useful as well:

FreeDFM.com will find these for you before submitting.
GC-Prevue is a free Gerber viewer that lets you inspect your layers as they would be plotted.

Then when I lay out the PCB I'll print it out one to one scale, and "populate" the paper PCB with the real parts.

I do that too, especially on a new component.