I own a number of the income/oil trusts and would like to add a few points.
1./ Much of the income you will receive will be treated as interest not dividend income.
2./ The income trust only have until 2011 to convert to real companies. Many of them have tax credits that will delay the effect of this.
3./ You need to look at the reserve life of the company you are investing in. Some of the money returned to investors is return of capital.