Are these lines un-connected ?
How much will the IC's, when mounted, load the lines ?
Try to "load" the line with, let's say, a 1 MOhm res
to gnd or vcc. My guess is that when everything is mounted
you'll see much lower crosstalk. *If* your design realy
is a high-impedance design, you could have problems.

Jan-Erik.

Ben Jackson wrote:

>I added a 1Mhz oscillator and checked at the clock inputs, so far so
>good.  Then I checked some nearby traces and found up to 0.5V of 1Mhz
>square wave on the very near ones.

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