That's right, the fourth round of beta testing is out. This version includes many bug fixes. Check out this thread for a list of map bugs, and you can get all your code change headlines over at the SourceForge project page.
Our good friend Plates has released a second version of his map "br_clayborn". The maps seems to be destined to be a great bank robbery favorite. His map is also in the beta stage, but it has but uploaded to the 1.1b4 game servers so you can play it with your online friends.
IMPORTANT: You still need Smokin'Guns 1.0 package in order to play 1.1b4. You can get the download here.