I'm running a rc version of W7(evaluation copy build 7100) and very pleased with it on my laptop except for one thing. It will not recognise or rather connect to any network after waking up from sleep mode. It won't even authorise my vodafone mobile broadband dongle. It requires a restart to connect which it then does perfectly happily. Everything worked OK when I was using XP.
Hows-about Hibernate?
Still does it even on hibernate