If you want to buy treasury bonds, bills, notes, etc. directly from the US Government, this is the place to do it. The fees are the lowest and you can trust them as much as you can trust any thing I suppose. The bad news is, as of May 3,2013 you essentially are paying the government to borrow your money since most (all?) real yields are currently negative and if interest rates rise as they one day will, all us bond holders will probably lose even more money. That said, what other assets look more attractive these days? I wish I knew...