Many of these companies have been having a rough time of it recently, so many of them have been beaten down quite badly. Some have had their P/E ratios pushed higher as their earnings fell with the economy. For some of these companies, their dividend payout may be reaching a high percentage of their earnings and the dividend may be in trouble. For those companies (like the oil companies) that have come out during their quarterly announcements and said that their dividends are of utmost importance, they'll probably see very limited growth in those dividends over the next couple of years.
But for many of these companies their current yields are hitting all time highs. As a result this may just be the best time in years to start, or add to, positions an investor may have already started. These may just be some of the best dividend yields from some of the best large capitalization companies in a very long time. Especially for dividend growth investors that tend to buy and hold their positions for years or decades.