In addition, they check for impedance as well...so when you spend weeks on
simulations based on stackups and impedance matching, you should get what
you design too.

For small simple double sided boards, I've never worried about testing.

_________________________________________________________________
The new MSN 8: advanced junk mail protection and 2 months FREE*
http://join.msn.com/?page=features/junkmail

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.