A great new Management Pack soon to be available.
The Web Sites and Services MP can be used to monitor availability and performance of Web Sites and Web Services by performing HTTP requests against the monitored entities.
On top of UI features that make it a snap to create Request Sequences for monitoring Web applications and Web Services and on top of core monitoring functionality, Microsoft have added a Web page content monitoring feature. When monitoring a URL that represents a Web page, this feature can parse the Web page content, extract and monitor all content resources (images, scripts, style sheets, etc).
You will find this feature very useful when you care about monitoring resources used by a Web page that change frequently. You could monitor the Web page content by explicitly adding the URLs that point to the resources, but that would require keeping the monitor in sync with the Web page as the resources it uses change.
You will also find this feature useful as a link checker because it can automatically extract and monitor all links on a Web page.
Watch this space for news on the RTW of this great MP