Google Products Feeds and Submissions
What is Google Products?
Google Products (formerly known as Froogle) is basically a search engine designed to make it easier for the conscientious shopper to get a bargain. So if you are a cafepress.com shopkeeper you will probably want your items listed there.
Actually Cafepress.com uploads feeds that include your products to Google Products but if you want to make sure that all your products are being represented you may want to upload your own feeds.
How to I create a feed?
There are three popular feed generators and you can use any of them to generate your feeds. You can go to their respective websites for details.
How do I upload my own feed?
The first thing you need to do is open an account with Google Base. In Google Base you will be given the option of uploading your items one at a time or as a bulk upload. More than likely though you will want to go for the Bulk Upload as it would be very time-consuming to input all the necessary data.
Once your account is open and you are ready to upload you will of course need the feeds mentioned in the previous paragraph.

Question about uploading all products
Hello last night I did the step by step how to upload my items to google. It seems only 19 out of 100's were uploaded. Is there a way to upload all my products?
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New Kid on the Block - Cafeoogle
This application is easy to use and has quickly advanced to version two in which you can automatically upload your feeds to froogle/google base.
http://blog.milkdrop.us/index.php/cafeoogle/