Stacky - Simple app enhancing windows task bar functionality with stacks of shortcuts.
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
MaxLauncher - A simple tabbed application launcher.
Synapse - Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.
LaunchBar by Lerup.com - LaunchBar is a small Windows freeware program that mimics the behavior of the dockable QuickLaunch...
DockbarX - DockbarX is a standalone dock that groups and launches applications.