I have been using Ubuntu for years now, but for a few months I got my hands on a shiny new iMac, while I had it I messed around with Parallels Desktop and fell in love with many of its features. One of the features in particular is being able to add windows programs to the dock in OSX.
I mostly use Virtualbox/Parallels for AutoCAD, SolidWorks, and Qucik books. So what I would like to do is be-able to install AutoCAD for example in virtual box, and then make a shortcut directly to AutoCAD and place it on the Ubuntu Panel right along with the rest of my Ubuntu Apps. So basically if I click on the AutoCAD icon in my Ubuntu panel, it will open virtual box in seamless mode and automatically launch AutoCAD, or If I click SolidWorks, it will automatically open in seamless mode, and auto launch SolidWorks, etc...
This is by far one of the best features in Parallels desktop for Mac and I would be great to beable to reproduce this function in virtual box. Also, I know they have or had, im not sure, Parallels Desktop for linux, but it doesn't have the same features as it does in OS X, at least thats what I understand.