As I discovered today, Google added a feature for users to “promote” search results and add comments.
However, this works only when you are logged into your Google account. Also, the “experimental labs” version of Google doesn’t have that feature yet either.
Try this link
Is Google making its own digg after the purchase of digg didnt work out? But so far, the comment can only read by myself…
Clicking on the X besides the promote button, you can also hide the search results that are not relevant for you.
EDIT: you can read other people’s comments, if you click in the bottom on “See all notes for this SearchWiki. This could be used, for example to send secret messages :P