Google’s $150 million YouTube experiment seems to be going well. The company says it will spend another $200 million to market the channels on its Web service as it works to upgrade its content and lure more viewers and advertising, the Wall Street Journal reports.  Citing a person with direct knowledge of the sales, the paper says YouTube has secured commitments from advertisers to run more than $150 million of ads on the channels this year. YouTube would not comment on the figure. People familiar with the initiative also told the Journal that YouTube plans to expand its channels initiative to Europe by funding a couple dozen video channels for British and French viewers by next year, YouTube vice president Robert Kyncl declined to comment. The site has launched nearly 100 new channels so far this year. [Full disclosure: Deadline's parent company PMC owns ENTV, a YouTube primary channel.]