They're probably the most respected ranking service. http://www.gomez.com http://www.gomez.com/scorecards/index.asp?topcat_id=3&subSect=finance
gomez: Schwab at #1; i would say nothing can be more biased, only web-based MM-backed non-EDAT brokers are on the list.
This is another one. http://www.gomez.com/scorecards/index.asp?topcat_id=69&subSect=finance I'm not gonna sit here and defend Gomez, I'm just saying that they're probably the best respected in general at what they do.
Spend big advertising $$ with them, your brokerage scores big. You may want to check out Barron's broker survey, they may be a bit more "on the level". They even cover direct access. Sorry, I don't have a link.