So far, the plugins I’m having trouble with after upgrading to PHP5 are:
OnlineNetworking 1.1
Ajax-Comments 2.0
AuthImage (actually, I had it working with Ajax-Comments before, so it may be an Ajax-Comments issue)
SurveyGizmo
emailShroud
In most cases, looking at the logs I see parse errors indicating a syntax error ‘unexpected $end’ — in some cases, the error suggests an unexpected “}”