There are services offered to traders that define market (e.g., S&P500) levels everyday as part of a trading system or methodology, and suggest their subscribers trade off those levels, or at least trade aware of those levels. For example, www.daytradersaction.com , www.winningedgesystem.com , etc. Does anyone know of a good such service or two? FYI, no, I am not trying to promote any of them, just trying to ask my friends for advice Any experiences/impressions/opinions? Thanks!