Lexis and Westlaw both have specific databases devoted to patent law. On Lexis, under the heading “Area of Law – By Topic” select “Patent Law”. On Westlaw, use the Directory to access “Topical Materials by Area of Practice” and then “Intellectual Property.”
You might also want to look at the BNA Intellectual Property Library, Patent, Trademark and Copyright Journal and Patent, Trademark and Copyright Law Daily.
Patently-O: Patent Law Blog (very popular patent blog)