Yeesh! There are many other boards out there where this would be considered on topic. This is not one of them. That said, try this M* article on cash investment options:
http://biz.yahoo.com/ms/050816/141832.html?.v=1
or this article at Bankrate.com:
http://www.bankrate.com/brm/news/mon...20030603a1.asp
or this PDF detailing a management company that made cash contributions to its money market funds to prevent them from dropping below par:
http://www.goodwinprocter.com/fsas/FSA_12_03_02.pdf

There has been one money market fund that has dropped below par ("breaking the buck"). I don't remember the name, but it dropped to $0.96/share or something like that. But in the end, the fund company liquidated the fund at par.

To Mountain Trader, Ameritrade is merging with TD Waterhouse.