Tiger Tip #2 – Widgets are cool..but not THAT cool
According to our good friend Activity Monitor AKA “Visual top” widgets take waste a crapload of RAM. I am sure we are going to hear a whole ton about this in the future but here is run down of how much RAM my current widgets are taking up.
My advice is to ditch the dashboard until Apple realizes that not everyone wants to spend hundreds on extra RAM.

Has anyone tried zaptastic? It supposedly demonstrates some vulnerabilities regarding the widget concept.