I was trying to get idea about streaming APIs. Trying the example given on following salesforce wiki page. 

http://wiki.developerforce.com/page/Getting_Started_with_the_Force.com_Streaming_API

but its not working . On  using JS console on chrome- getting following error : 

"Appending message type to URI /cometd/23.0/ is not supported, disabling 'appendMessageTypeToURL' configuration"

Please let me know , if anyone has any idea about it. I've tried to take care all things mentioned in following post. 

http://boards.developerforce.com/t5/Streaming-API-Developer-Preview/Error-trying-to-do-the-Visualforce-sample-of-Streaming-Api/td-p/349157

thanks !!