Looking at the best-performing exchange-traded funds by objective in August, we can see which groups stood out from the crowd. Some have run their course, but others may be up for another lap or two.

The first two bullish standouts are a bit counter-intuitive amid talk of a recession and housing crisis. However, the

Retail HOLDRs Trust

(RTH) - Get Report

bottomed in July and has extended gains into September. The U.S. government's stimulus checks helped bridge the gap to pre-holiday-season spending, supporting holdings of

Wal-Mart

(WMT) - Get Report

,

Home Depot

(HD) - Get Report

, and

Target

(TGT) - Get Report

.

While the Retail HOLDRs are trading at a reasonable average of 16.3 times earnings, homebuilders like

Beazer Homes USA

(BZH) - Get Report

and

Hovnanian

(HOV) - Get Report

have lost so much money, the aggregate P/E ratio of the

SPDR S&P Homebuilders ETF

(XHB) - Get Report

can't be computed. Yet, the Homebuilders ETF did well in August and is building on its advance. Bargain-hunting investors calling a mid-July bottom to the stock, at its lowest point on record, are hoping most of the bad news in this sector has passed.

The last two bullish picks are inverse funds that performed well in August and are continuing their climb in September as the underlying indexes slide lower.

As the U.S. dollar rallies back to its highest level since September 2007, the price of dollar-denominated gold has dropped to the $740 an ounce level. And, the more the futures contracts tracked by the Deutsche Bank Liquid Commodity Optimum Yield Gold Index sink, the higher the 200% negatively leveraged

PowerShares DB Double Short ETN

(DZZ) - Get Report

spikes.

Another 200% negatively leveraged fund had a good month in August. The

UltraShort MSCI Emerging Markets ProShares

(EEV) - Get Report

gained 12.2% as the underlying MSCI Emerging Markets Index gave up 8.2%. If weakness expected in emerging markets materializes, the accelerated upward trend in this fund may have legs.

Finally, one fund on the list below that appears to be doing well really isn't and should be avoided. The

Claymore/MAC Global Solar Energy Index ETF

(TAN) - Get Report

found a solitary ray of sunshine in August, up 11.4%, before the rain clouds closed back in sending the shares to a record low in this five-month-old security. The fund's average P/E ratio of 109.5 is four times that of the

S&P 500

, implying there is more room to fall. If the presidential polls keep shifting toward the oil-drilling party, this fund may become an enticing short-sale candidate.

As with any trading strategy, you can lose money. Remember to place stop-loss orders to help protect you from sudden moves against your positions.

For an explanation of our ratings,

click here

.

Kevin Baker became the senior financial analyst for TSC Ratings upon the August 2006 acquisition of Weiss Ratings by TheStreet.com, covering mutual funds. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.