I am currently running Vista x64 for my primary trading platform with Ninja and TWS, and then use VMware Workstation for a couple of XP VM's for backtesting and such. I am considering switching to Ubuntu 8.10 x64 and using VirtualBox 2.0.6. I would use a XP SP3 install in VirtualBox for Ninja and IB's TWS. I will also have to run Office 2007 in this VM for other reasons. Was just wondering if there is anyone else out there running a similar config, and if so, if they can comment to success/failure/potential problems. I've been testing things out as best I can by running Ubuntu under a VMware VM on top of Vista, and then running VirtualBox under that (sick, yes) and so far haven't seen any major issues. Nearing the trigger pulling time... Thanks, Mike BTW, system is a C2D E6850 with 8GB, 3x320GB RAID 0, 1TB backup disk, and 3x22" widescreens.