Inverse/Leveraged Funds

Go to the following sites...
ProFunds
ProShares
RydexInvestments

You can see how they setup the funds in their annual reports.

Inverse Funds:
- Fixed Income: Repo + Bonds
- Inverse: Futures(Short) + Swap(Short Equity Index)
- Hedge: Options(Buy Call)

Leveraged Funds:
- Fixed Income: Repo + Bonds
- Leverage: Equity(Long) + Futures(Long) + Swap(Long Equity Index)
- Hedge: Options(Buy Put)

Commodity ETN, ETF

iPath offers GSCI(GSP), Dow Jones-AIG(DJP), and Glodman Sacs Crude Oil(OIL)...
iShares offers GSCI(GSG), Gold(IAU), Silver(SLV)...