Save More - Want to start investing with ETFs?

I have been investing for quite a while. I started with Sharebuilder but now I use BuyAndHold.com. It is a lot cheaper to trade using "windows." I have had no problems with them. I buy ETFs and some single stocks. I would recommend ETFs as your core portfolio. Mix in some gold and enerygy stocks and voila - instant portfolio. Going back to my account of preference, BuyAndHold, I wonder why not too many financial bloggers recommend this site to start investing cheaply. Because it has no referrals bonus like Sharebuilder? Although the tools are not the best in some point non-existent, I have had no problems trading. I am happy though.