The book Super Sectors: How to Outsmart the Market Using Sector Rotation and ETFs (Wiley Trading) by John Nyaradi clearly shows investors how to use exchange traded funds to take advantage of industries and sectors that are rising. He doesn't believe in buy and hold, and he also doesn't believe in dollar-cost-averaging. He does believe in actively managing money using ETFs.
The book has a couple chapters on using point-and-figure charts, a chapter on choosing sectors, and one on when to sell your shares. One chapter that shouldn't be skipped is called The Psychology of Trading. Near the end of the book, Nyaradi covers in detail what he considers the five 'Super Sectors'. (I won't ruin the ending by telling you what those five are.) The book also includes some interviews with top traders and a compilation of ETF resources.
If you have considered investing by sectors using ETFs, then Super Sectors is the book for you.