CE is the Consumer Electronics organization here you can see the latest information on consumer buying trends. IRMA is the International Recording Media Association. Here you can find information on all tape and optical media formats. The APA site has listings for everybody doing anything in Arizona. Check them out and get involved.
Variety is probably the Big publication for the film industry.
Since films seem to be the dominate use for DVD, this industry publication is included here. Hollywood Reporter is another film biz must see. Lots of news daily.