Real men trade long bonds

Here's an old article about the merit of investing in long bonds (treasury with
maturity close to 30 years).
http://www.safehaven.com/article-3081.htm

If you use a strategy of investing in 25-year zero coupon bond since the
beginning of 1981 and every year swap the old bond into a new 25-year zeros,
you would have an annual return of roughly 21.8% from Oct 1981 to April
2005, handily beating the return of S&P index with reinvested dividend.

The best vehicle to gain exposure to long bonds for retail investors is 'TLT',
the Exchange Traded Fund that mirrors the return of the Lehman Brother
20+ year treasury index.