When you search for a solution like: "sdf.exe error 1324" or "Activate Windows Remote Desktop" or something else it would be useful to have a "This link helped me" button that ranks the link higher in the search results for the next search and maybe says "This link helped xx people".
I did a search for "cinch-cable" and wanted to know something technical. The only results I saw have been sites to buy. There are millions of them and the technical information I searched was not at the top 100 results. It took me very long to find my result. It would be useful to add a system to add sites to "Shops". There is an icon in the search results where the user can mark a domain as a shop. When most of the results show shop-results there should be displayed a message where the user can decide to hide the shop-results.
It could be useful to sort results for each user individually. When a user opens a website very often this one should be in the results at the top position.
It would be useful if it would be possible to mark links in the results as broken. So they can be filtered out the next search.
I searched for download the last five minutes and many search results gave links which are broken or sites which have broken links. For a better search they could be filtered out the next time.