Do you still need to get Websphere MQ integration done? I work for Apatar, an open source data integration project ( http://www.apatar.com ).
Apatar does not support Websphere MQ natively, but supports XML. Also I could have in-house Apatar developers to develop native Websphere MQ connector should we would have a pilot customer within the Alfrescro community that needs Websphere MQ connectivity.
We have the following connectors available as of April 15th, 2007: MySQL, MS SQL, Oracle, PosgreSQL, Sybase, Salesforce.com, XML, FTP, POP3, CSV, XML, WebDav, and even Flickr.
Please let me know if you are interested in becoming a pilot customer.