Does anybody else do work this fine with success?
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     There are different classes of PWB vendors.  I will NEVER NEVER NEVER buy
     from low budget PWB vendors again.

     Typical PCB fabrication limits (without paying extra).
     6 mil (thousandths of an inch) run width.
     6 mil spacing between copper features.
     12 mil plated holes.

     These sizes permit you to run traces between the pads of (50 mil pitch)
     surface mount IC's.  For general habits, I usually try to stay with 10 mil
     runs, 8 mil spacing, and 20 mil drills as minimums.

     Joe