While many prefer KDE's single wide taskbar, the double-panel style in Ubuntu/Gnome gives more navigation space and does a good job of keeping distinct actions separated in the UI.
This guide describes the process for applying Ubuntu/Gnome-style layout to Kubuntu/KDE's panels, giving a consistent look across the two. If you are going to be using both desktops interchangeably then having both desktops share a basic interface should improve useability.
Read the complete guide here.
NB. The above is a link to my personal site where this HOWTO & screenshots/etc. are hosted. I asked and was given permission to do this. If you have any suggestions / improvements, etc. please post you're comments here on the board.
Enjoy.
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