Yeah, just don't pause/stop/delete it after it finishes downloading, and you'll continue to upload data for others to DL. At the very least, leave uTorrent running long enough to seed as much as you've leeched. If you don't have a daily/monthly upload limit, then you can seed more if you want. I left it seeding at a 100 kb/s limit while I slept, and ended up seeding over 2 GB (four full downloads) - it's that easy.