Using Google Base

What's Google Base in the first place?
Think of Google base as an online database with powerful search features hidden under a simple user-interface. Using this you can upload contents and describe them with attributes so that Google crawler understands what those items are and what contexts those items would fit in.
The idea is simple and nice. You don't need a website to share your content and publishing contents off Google Base is a click of a button. Publishing essentially is informing the crawler about your content, the published content immediately appears in the Google Base search results, the ranks of the published content may depend on varieties of other factors. Users of Google Base also benefit from its seamless integration with AdWords to popularize content.

What kind of content?
As per Google, the contents could be anything, definitely has to be digital - on a lighter note.
On each item you can attach up to 15 files in these formats: PDF (.pdf), Microsoft Excel (.xls), Text (.txt), HTML (.html), Rich Text Format (.rtf), Word Perfect (.wpd), ASCII, Unicode and XML.
As of now, the total size of all uploaded files may not exceed 20 megabytes. There is a customary "we reserve the right to review all items in order to ensure they comply with the Google Base Terms and Conditions" clause to keep out spam and other malicious content.

How do I submit content?
Google Base has a nice and easy-to-use form interface to submit content, for large contents there is a bulk upload option too. It may not be too long before you see a desktop tool from Google to upload contents directly off your desktop.