How do you handle product descriptions. Is it necessary for us to write our own descriptions for each item instead of using the manufacturers description?

Could this be causing a duplicate penalty?

wellcome to www.0058.net

It would help. Often the largest problem is if the product comes in multiple sizes... they tend to have the same description so adding a drop down menu (with the different sizes) can usually help in the situation.

What i found to be beneficial in avoiding duplicate content and just a better website overall, is writing a short, concise, but relevant description for each item. Then make a popup available when a visitors clicks on the more information button. You can put detailed specs and info on the popup. A lot of visitors already know what they are looking for anyway. For the ones that don't, a quick user initiated popup doesn't hurt, and the user never leaves the page.

Obviously if you have 10,000 products this isn't going to work but for smaller catelogs it can be beneficial.