.

Overall though, the national inventory rose by more than 7% to 4.09 million units. That will continue to keep prices low, according to Mike Larson, a housing analyst with Weiss Research.

"There's a bifurcation of the market," he said. "There's excess supply putting downward pressure on prices and people respond to the lower prices by buying homes."

Housing is its most affordable in many years, he pointed out. "Falling prices is not part of the problem, they're part of the solution," he said.

Hurting home sales have been stubborn increases in job losses. More than 6.7 million jobs have been lost since the beginning of 2008.

That's one reason why Robert Dye, a senior economist for PNC Financial Services (PNC, Fortune 500), is keeping his optimism in check.

"I wouldn't go overboard on this number," he said. "The economy is still healing and will continue to run into some bumps. But it does bode very well for the future and shows buyer confidence is increasing."

There is one potential bump, however: The looming end of the first-time homebuyers credit. The credit gave first-time homebuyers an up to $8,000 refund on their taxes if they close on a deal before Dec. 1. That credit has been motivating buyers, and when it expires, demand could dry up.

"Just like with the cash-for-clunkers program, we run the risk of a letdown as the program runs its course," Dye said.

Regionally, the strongest market was the Northeast, where sales soared by 13.4% to an annualized rate of 930,000. That was 3.3% higher than last July. The median price of homes sold during the month was $236,700, off 15% from last year.

Midwest sales rose 10.9% to a 1.22 million rate, 8% higher year-over-year. Prices there have sunk 5.9% over the past 12 months to a median of $157,200.

In the South, sales were up 7.1% from June and 5.4% from last July to a rate of 1.95 million. Price have dropped 7.1% to $164,500 over the past 12 months.

The only region reporting a slip in sales was the West, where they fell 1.7% to a rate of 1.13 million. That was ahead of last July, however, by 1.8%. The median price there was $202,300, a whopping 28% below what is was a year ago