Personalization

Search is always returning same results, particularly if searching customised websites , how about just searching document I have not read before. That would be nice, if the link has been opened before, the document would not come out and save my time. Optionally, user can choose searching all docs including read. So how and where to store which document or URL is read. IBM's domino application does this feature years before, and actually the tool is very well designed. I can go to a notes database, turn on show 'unread only' or all'. This is stored in people's desktop. Similarly, this can be done in user's computer. It can satisfy most of cases. If user is browsing web office, home and pub, such information has to be installed somewhere else and browsing has to be user-name driven. This can be done, if Google can provide such tool, log in once, store opened URLs centrally.

The other question is for all pages it does not tell you when it was created or last modified. If it is modified, then the document should be searched out. How to find out when the doc is modified has to rely on search index. I am sure by using Google's index and webmaster, and providing another place storing user's history (actually Google does provide such tool), this feature is not hard to implement.

Personalization is a large area to explore.