7+ Taskbar Tweaker - 7+ Taskbar Tweaker allows you to configure various aspects of the Windows taskbar.
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
TaskbarX - TaskbarX gives you control over the position of your taskbar icons.
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.
TranslucentTB - TranslucentTB make Windows Taskbar transparent
DockbarX - DockbarX is a standalone dock that groups and launches applications.