Well, it's extremely basic, but I've knocked together my first Widget for Dashboard in Tiger: http://mart.ozmac.com/widgets/ (okay, so it's pretty rough and unfinished, but you get the idea)
It is incredibly easy to make a Dashboard widget - No programming required - Have a go and copy mine and substitute your own web page, change the images for the icon and background image and the dimensions in the plist file and viola! I can see there is going to be a HUGE number of widgets available in the coming weeks. My example displays the current 7-day Wind and Waves forecast from http://seabreeze.com.au (essential for mad-keen windsurfers like my wife and I) -Mart
