A list of the attacks that you've made, all the way to your first attack (after this is implemented). MY reason for this (there are probably better ones) is: During the dog tag competition while randomly putting in IDs to find players and exhausting my refills, I found a couple who had millions on them. I bookmarked them on my laptop, and ever since then have daily mugged them. Due to circumstances beyond my control, I no longer have access to my laptop, and am playing Torn on a different PC. Gone are all my bookmarks, and my income. If I could but see a list of the players I've attacked, my income would be secured.
Another idea along the same lines, is to make attacks show up in your events. I can't find it any less annoying than when I have 200+ items on the market and someone buys them all, and every single one shows up in my events.
OR, perhaps an option to save attack logs, and make them retrievable from a database using your API key.
EDIT: And then, this idea could be implemented with the separate database. So you choose to save your attacks, and can retrieve them from a database later. This option could be put in preferences, so perhaps: "Always save attacks" "Prompt to save attacks" "Don't save attacks"
Either way is fine for me, so long as I can find the people I attacked.