In Safari on Leopard there is a cool new feature called Web Clips that allows you to put a section of any web page onto your Dashboard as a widget. You just click the web clip icon in Safari (it looks like a pair of scissors) and then define the section of the page you want to capture. Once you are done defining the section, click the "Add" button and that section of the web page will show up on your dashboard.

This is a great technique to keep up on web pages that don't offer RSS feeds. You can set up 10 web clips from different sites and then go to your dashboard and see all of the pages at once.