This week, over 120 companies will be launching products at one of two trade shows focused on start ups: Demo 08 and TechCrunch 50. Having worked with companies launching at previous Demo shows, I know that preparation for these shows takes an incredible investment of time, resources and money on the part of the start up. Unfortunately, when two similar shows occur at the same time, the one predictable result is that spotlight is removed from the start ups, and the volume of news makes it much harder for any particular start up to attract attention.

As previously noted, more people read about a trade show, then attend. This means that garnering press coverage is one of the most important aspects of trade show exhibiting. This is especially true when the trade show is sponsored by a major media organization – in this case TechCrunch and IDG News.

With the first two days of each conference completed, what can we say about the press coverage. Much of the mainstream media coverage has been about the organizers, the competition, and comments about commenting about the competition. The two shows also have generated a firehose of information.

Quite frankly, with 120 companies in 2 days, the overall impression becomes a blur of start ups with mobile, social networking, video, microblogging, advertising platforms. To make matters worse, there also is a CTIA Wireless show in San Francisco this week with hundreds of companies vying for press attention.

For companies that are not exhibiting at these shows, avoiding issuing news during high traffic trade show weeks becomes an imperative. The collateral damage from these simultaneous shows is not limited to exhbitors.