The latest discount brokerage (as reported on this FW thread) is Sogoinvest.com. They have a few pricing models, some of which include subscription fees. From what I could gather from their website, the bottomline is that for the plan without subscription nor inactivity fees, you only pay $3 per trade (market or limit), for up to 5000 shares. One of the feature is that they support automated dollar-based investing — which could be useful for those applying DCA with their ETF investments.
Overall, this is not a bad deal, and is probably better than the previous Izone-Seattle offer of $3/trade with $50 annual fee. Obviously, this assumes that all other references checks out OK.