I have been using Windows 7 for quite some time now, and one thing that has been bothering me is the performance (euh, lack of performance) when using the Open with Windows Explorer option in SharePoint. Opening it, using it is sooooo slow.
But recently, I read this post of Amanda Perran. The lack of performance seems to be related to a setting in Internet Explorer: under Tools, Internet Options, Connections, LAN Settings, you need to uncheck Automatically detect settings. This magically increases the speed of your Explorer View, but what is even better: drastically decreases the load time of Office documents when opening them from SharePoint.
So this is something every user should know. Spread the word!
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I found that disabling the QoS service on the adapter helped.