An observation:
Aside from the obvious monetary gain from no longer paying commissions on trades, I am finding something I like at least as much. Not paying a commission makes me more likely to consider high price stocks. For instance I'll consider buying 10 or 15 shares of LMT (somewhere around $400 a share) now where before I wouldn't want to split the commission on 10 shares. I know it is relative (4.95 a trade is the same on a $5000 trade whether its 10 shares or 100 shares), but the thought of paying 50 cents a share in fees bothers me psychologically more than paying 5 cents a share.