The latest biber (0.5+) seems to work only with the biblatex 0.9+. On the other hand, biblatex 0.9 breaks several individual styles like biblatex-mla, etc., and as long as the authors of these styles do not update their styles, their users cannot use the biblatex 0.9 version. Without biblatex 0.9, they cannot use the biber 0.5+ either.
So my request is: if it is not too much work, please make biber compatible with biblatex 0.8+. Then you can retain many users with the latest biber, resulting in more bug reports and consequently a better software.
Or maybe I don't know how to use biber 0.5+ with biblatex 0.8+. If anyone can enlighten me regarding this matter, I will be much obliged.
thanking in advance.