Here's the word from NASA on what's happening with the investigation into the problem with the engine cut-off sensor that was malfunctioning - 'The sensor protects an orbiter's main engines by triggering them to shut down in the event fuel runs unexpectedly low. Space Shuttle Program managers plan a series of meetings Thursday to discuss the problem and determine the steps necessary to get back into the launch countdown. As of now, the most optimistic possibility for the next launch attempt is no earlier than 2:40 p.m. EDT on Saturday, July 16.' NASA has been really good about updating their Return To Flight section of their site, so check there for further updates.
I had tried to write an update about the Shuttle launch as soon as it was announced, but Blogger had some weird glitch and wouldn't publish my post. I tried a few times and kept getting odd errors. Then I look at the blog later, and there's the post Blogger was telling me it couldn't publish. Maybe Blogger was overloaded with people posting all at the same time, I don't know. Weird stuff, but it seems to be better today.