Sysinternals, company that was started by two programmers and latter bought by Microsoft, had always good freeware tools for administration of windows. Best thing was that they were freeware.
Yesterday they have published a new tool with symbolic name Desktops.
This tool allows you to have up to 4 virtual desktops with separate systrays and programs on them. Even alt+tab combination doesn’t take programs from another virtual desktops so if you have runned program on one virtual desktop you won’t get it with alt+tab on another one.
Best of all, you can guess, it’s free, with size of only 62kb and you can get it here.