My DSL connection is somewhat unusual in that my upload speed is not much lower than my download speed. Download is about 1-1.2 Mbps in reality, while my upload speed is right around 900 kbps. Often when I'm downloading something big, I end up seeding more than I've downloaded before I'm even finished with the whole download. Anyway, I try to always do at least 1:1, but sometimes I seed much more than that on smaller files. My over all ratio for all the Bittorrent I've done is around 1.5 as reported by the main tracker I use. Bittorrent really only works well because on average people seed at least as much as they leech. So as far as etiquette goes, you should always have at least a 1:1 seeding ratio.