The issue has been talked about for quite a while here in Canada, most prominently just before the election about a year ago. The Liberal finance minister back then quashed the taxation issue and some suspected it was an election ploy (and there was also a nice 10 % bounce on income trusts just before that announcement, which prompted RCMP investigation and pro-Liberals wondered if there was a right wing agenda behind that).
Newspapers have been talking about the risks of these Income Trusts losing 30-40 percent of their value not for months, but for years now. Some of the issues that have been raised are, of course, taxation, and the fact that sometimes these distributions are merely return of capital, which should eat up the book value of the Trusts but the market seemed to be ignoring it, valuing them higher and higher. Some were concerned to see businesses that had no business turning themselves into income trusts redressing their shares with the fancy gimmick, and the market blindly threw money at them for doing so. Well, we've had bre-x, Nortel, and I suppose now this. We all knew it was a bubble, many of us knew it would eventually pop though it lasted heck of a lot longer than most skeptics thought.
Personally I disagree with the idea floating around here that the Canadian government somehow just killed the goose that lay golden eggs. Also, the Canadian dollar has been too strong to the possible detriment of our economy (the part that actually produces stuff) because of the capital glut.