Why don’t you turn off the PageRank feature in the Google Toolbar?

Why don’t you switch off the PageRank Toolbar feature? It is widely used by link sellers as a link grading system. Why do you continue to display PageRank publicly? It appears to have little relevance, except to spammers.
Danielroofer (aka Daniel Weadley), Camberley, Surrey, UK

How does Google consider site-wide backlinks? Matt Cutts


Matt Cutts answers – How does Google consider site-wide backlinks?

The importance of ALT Tags for images

If you want to understand the importance of ALT tags for images watch this video from Matt Cutts – Google Head Search Engineer.