I was asked to upload the SDK that I was originally using to develop for PS3. So here it is.
But I would like to take this moment to point out that there is little to no real reason to continue using the official SDK. Although I have some complaints (pretty much exclusively relating to documentation and setup) I have found the open source community made tools to be entirely competent. I strongly recommend that anyone planning to develop homebrew use PSL1GHT and NOT the leaked official SDK that is posted above. Even if you are interested in tinkering with the official SDK it is my understanding that equally complete and functional copies of more recent versions then this have already been leaked.