I would like to see intelligent auto-downloading. Here is how this would work.

After sharing a file, I would have the option to assign that file to a category(s) and assign it a rating of 1-10. For example, I could put a file in the "80s Hair Bands" category and assign it a 9. This metadata would be saved and shared in a seperate directory. The category list would contain a fairly large list of "hard coded" categories but I could also add my own unique category if I wanted.

The filename for the metadata file would be something like the SHA1 hash of the file I was rating. This file would also have a unique identifier to show I was the one who voted.

I would also have the option of turning on a "peer ratings auto-download" option that would then search for and download any metadata files for the same hash. Once it found someone who voted the same way I did for the same file, it would go and download all the rest of that user's rating metadata files for that category.

Limewire could now create recommendations inside a category of what to download by telling me what others voted highly for.

It could even have an option to automatically download any file that was given a rating above a threshold. For example, I could tell it to automatically download any MP3 recorded at 128 kbit/s or higher that was rated an 8 or higher.

I could leave this running overnight, wake up in the morning and find a whole new collection of files to check out that I should have a pretty decent chance of liking.

What do you think? How hard to implement?

Its more redundant then anything. the only reason hosts are not finding files is how the network is currently set up. But that will change in the months to come with this Leaf and Ultrapeer implementation. This will create a larger horizon for everyone with less network connections and bandwidth. LimeWire is the only one at the moment with Leaves and Ultrapeers. Just wait until all clients have this. Gnutella will be the biggest and best P2P yet.