There are many idea posts out there. Among the best are Rixx's continuing "Gooder EvE" articles. I remember this idea being discussed before but I couldn't find it in the 20 seconds of attention span I could spare to try.
The idea: ship service history. Basically from the moment a ship first pops off the assembly line it starts accruing data in a simple text based database field. Whenever any major even happens in the life of the ship it gets a note appended to this field. I wouldn't want an idea like this to be a drag on the system so it would only need to make these appends when an event was already causing a database action, or even at downtime.
The nice thing about this is that we would actually be able to know how old a ship is, how many times it's been repackaged, how many times it was involved in a killmail (obviously on the winning side...duh), and more. I for one would love to know about my ships, especially those I buy blindly off of the market. I don't think you should be able to view the service history of a ship being sold on the market because that would just be a drag on the market and my time. But it would be nice to buy a ship and open it's service history to see some cool fact like: it fought at the CVA fall in DGTMI, has been repacked 10,000 times, or has scored 2,000 kills (of course the specific battle would only be know by time/location codes and good ol' fashioned assumption but you get the point).