Display/Projector question

I am running a presentation using a projector. I'll be using keynote to run the project. Is there a way to view another window while I am running keynote on the projector, I would like to view my blog or other site for notes or reference, but I don't want it to show-up on the projector.
Any ideas?

Set the monitor to be a secondary monitor rather than mirror the primary screen. Then just drag Keynote over to the projector and use the primary screen for other things.