I've noticed an alarming increase in false positives being detected by Google Apps For Domains GMail spam detection. It is so bad actually that I'd rather turn off GMail spam detection altogether. My own service SimpleFilter does a much much better job at spam detection and so much less false positive that I have to begin thinking about not using Google Apps GMail for my domains now. They really should allow one to turn on or off the spam filtering or at least some sort of basic options.

I've been using Google Apps For Domains with most of my domains for a while now. See here.