Here's an interface issue that has been bugging me (sorry if it has already been reported, didn't find anything when searching): If you put Parallels in the background, and then click inside the VM-window, Parallels will passthrough the click to the VM instead of just activating the (Mac OS X) window. However, Apple's Human Interface Guidelines has stated since the eighties or so that a click in an inactive window should only activate the window, not take any action based on the click (with a few exceptions, see references below). Windows, on the other hand, has the activate-window-and-take-action that Parallels currently uses. How about adding a preference "Click in inactive window: [x] Activates window. [ ] Activates window and clicks."? (In case some users have already grown accustomed to the non-standard behaviour.) References: http://developer.apple.com/document...delines/XHIGWindows/chapter_17_section_4.html (lists some of the situations where click-through can be useful, but "In many cases, however, click-through could confuse a user who clicks an item unintentionally.") http://developer.apple.com/documentation/mac/Toolbox/Toolbox-190.html