Problem gettin' rid of Parallels 6

IMO none of these so-call uninstallers can do a complete job of removing all the potential stuff that can be installed and/or created by some apps, etc.

I haven't tried installing Parallels yet (it's on my to-do list) or I could tell you exactly what it installs*. So this is some general suggestions...

You say you looked at the LaunchAgents and LaunchDaemons. Did you look at both the ones in your user library (~/Library) and the ones in /Library? Did you check your login items in your System Preferences Accounts? Have you checked the StartupItems directories in /Library (and possibly ~/Library)?

* One way I use to track what something installs and creates is to use fseventer. It graphically shows file system changes. So I run it during installs and first executions of stuff and keep a record of all the stuff that the app, etc. in question creates. Then, if I later need to uninstall it I can clean it all out. It still takes some understanding of the system however to be able to know what's pertinent in the fseventer display and what is not.

You should have used the uninstaller app that is included in the Parallels installer package. You can try running the uninstaller now but you may have to reinstall Parallels and then use the Parallels uninstaller to properly clean everything out.