My first Ubuntu customization: it's very simple, but I like for this!
About used tools:
Theme: Mac4Lin_GTK_MacMenu_0.4.tar.gz (I haven't found the original source, sorry... So, I've uploaded the tar package).
Icons: Dropline NOU! (http://www.gnome-look.org/content/show.php/Dropline+NOU!?content=53292)
Font for look: Trebuchet MS
Firefox theme: iFox Metal 3.0.3
Screenlets: Feedreader, MyIP, Places, Ringsensors (front color #E2C77A); Trash