The number of U.S. jobs posted online rose to more than 4.8 million in August, up 7% from July, according to The Conference Board's measure of online help-wanted ads. Compared to August 2007, the number of online ads was up 4%.

"We have seen no real improvement in labor demand throughout 2008 and there is little or no indication in the data that there will be a turnaround in employment for the rest of this year," said Gad Levanon, senior economist at The Conference Board. "However, the August seasonal rebound is some positive news that American business is still looking for workers."