Do uninstallers uninstall?

I try out a lot of software, much of which I later uninstall. But the uninstall routines on the PC often leave artifacts behind (bits which the installation has burrowed into your system like tics, and which can cause all sorts of problems later on). This is one area in which the Mackintosh excels, because when you install a program it does not modify the system, so the number of system and software conflicts are greatly reduced. So how can you extract those last bits you don't want? PC World's Lincoln Spector provides one answer.