I was aware that this was going to happen at some point (based on posts I recall from B-Greek) but didn't know it had started.
The New English Translation of the Septuagint (NETS) has begun to release provisional editions of books online as PDF files. These may have been posted for some time, but since I didn't know about it I thought I'd mention it. If this release is widely known, and I've just been oblivious (quite possible) I apologize for the noise.
Provisional editions of Genesis, Exodus, Leviticus, and Deuteronomy are available on the NETS Provisional Edition page. I was looking for Pietersma's edition of Psalms since it is actually published but I don't have a copy. I should've picked one up at ETS. <sigh>.