The Google Blog announced the release of Google Patent Search. You can search for any patent, and if Google indexed it from the United States Patent and Trademark Office (USPTO) then hopefully it will come up. Google uses a combination of their search technology, Google Book technology and hopefully will be adding "saving" and "printing" features to the tool.
I conducted an advanced search to find all patents with the assignee as Google and came up with 29 documents. Why did I need to use the advanced search, because a simple search on Google brings back some unexpected results (for me, at least). It is important to remember, a patent application is not the same as an issued patent (thanks Gary).
If you are into this, I recommend you read Gary Price's compilation of Other Free Patent Search Databases for U.S. and International Patents.