SourceOP is in progress and coming along nicely. I got some stuff (namely entmoving) working that I didn't think I could before the first release, so I'm going to try and get that finished before the release. This may cause a slight delay in release, but it should be worth it. The first release may have some compatibility issues, but these will be addressed and fixed at a later date. My goal is to at least get it working with both HL2MP and CSS for the first release.