I use it all the time for weather and stickies mostly. Since I have a PB that all most never gets shutdown Dashboard is always running. I find that I don't even notice the extra RAM loss because OS X uses RAM so efficiently (that and I have 1.25GB).
macman2790, you can put widgets on the desktop by dragging them out of the widget selection bar and then hitting F12 and drop it on the desktop. Although, it goes back to dashboard as soon as you hit F12 again. I always thought Konfab was useless because I didn't want to see the widgets on my desktop. I love Dashboard.