Nielsen’s holiday retail forecast predicts a 4.7% gain in dollar sales over 2007.  Unit sales, however, are expected to be virtually flat (-0.8%) versus a year ago.

The forecast includes projected sales at food stores, drug stores, mass merchandisers, and convenience stores, across 125 product categories tracked by Nielsen.

With the economy in turmoil, the 2008 holiday season will be closely watched for indications of declining consumer spending.  Declines in consumer spending were last recorded in the fourth quarter of 1991, during the recession of the early 1990s.

Go behind the numbers: read NielsenWire’s Q&A with James Russo, co-author of Nielsen’s holiday retail forecast.

View in depth data on holiday retail sales projections and consumer spending expectations.

View the full press release.

Read coverage of Nielsen’s findings in Convenience Store News and Adweek.

Submit questions about the report to Nielsen forecast co-authors, James Russo and Todd Hale, by commenting below.

But while mobile media use has grown rapidly in recent years, mobile advertising has been slow to take hold, Nielsen Mobile reported in a white paper released Tuesday.

In the U.S., some 76.8 million mobile users recall seeing advertising on their phones, according to Nielsen, but 63% report encountering mobile ads only infrequently — once a month or less.  Meanwhile, less than two-thirds of website homepage page views feature mobile advertising.

Lack of awareness of the size of the U.S. mobile audience, the complexity of the mobile marketing ecosystem, and advertisers’ reluctance to invest in mobile advertising are among the key factors restricting mobile ad growth, Nielsen’s analysts note.

View the full white paper.

Read MediaPost’s coverage of Nielsen’s findings.

Learn more about the outlook for mobile advertising – check out VentureBeat’s Q&A with Nielsen’s Senior Vice President of Mobile Media, Jesse Goranson