What's new in version 2.20
Version 2.20:

Tabbed docks
System tray support
Icon reflections
Background blur-behind
Brand new User Interface and revamped menus;
Now displays all running programs in your dock, allowing for pinning & unpinning ("Show Applications" mode);
Mouseover effects previously only available
Ability to show minimized-windows-only in the dock;
Ability to have the dock always on top, but autohide when there is a maximized window (on by default);
New weather module with greatly increased reliability and built-in location search;
New true-stretch background drawing mode (among other tags) for improved skinnability;
New high-quality artist-prepared bundled backgrounds;
New icon-transparency setting, with new 'ghost mode';
Drastically improved background browser.