>One thing I see every once in a while on HN is people with the belief that they can spend a week or two knocking out an algorithmic trader and start raking it in. In order to break this illusion I would recommend: http://financial-math.org/http://www.quantresearch.info/
Totally agree. I was aiming more for those who just want to rebalance their portfolios every month or something like that, though I acknowledge that the services I linked to do have communities interested in active trading.