It’s been a relatively quiet week for the Apple-focused blogosphere. Apple did announce the dates for its Worldwide Developers Conference, which is set for June 8-12 in San Francisco. WWDC just so happens to the be the venue in which Apple is widely expected to release its next version of Mac OS X — “Snow Leopard” — which may be prettier than expected. Meanwhile, Apple quietly added an option to double the memory in its 15-inch MacBook Pros, and a security company caught some nasty OS X malware on video.