If you install LeeSoft's completely free ViOrb in your VMware Fusion Windows XP virtual machine (VM), then set the VM to use Unity mode, the ViOrb will stay running at the bottom left of your screen. As long as your dock isn't massively long, there's plenty of room for the Orb, and it works just like your Windows Start menu. You can then run programs in Unity mode and have access to the full Windows start menu, similar to Parallels' Coherence mode.
[robg adds: The functional Start menu is the one Parallels feature I miss when using Fusion, and ViOrb provides a relatively seamless workaround. (To get the original Start menu back, just right click on the ViOrb and select Exit from the contextual menu.)]
Mac OS X Hints
http://hints.macworld.com/article.php?story=2008112212444088