I want to install the new version of
biblatex 2.0 in the Tex Live 2011 distribution installed on my Mac. Could someone give the steps to do this?
On a mac, this should work - say your biblatex-2.0.tds.zip is in /tmp:
This will install it in your local texmf tree. Remember to delete the installed files when you eventually upgrade to TL 2012 and install biblatex 2.0 via the TL manager.
To install biber 1.0, simply get the binary for your platform from SourceForge:
and put it somewhere in your path before the TL one.
EDIT: Wrong answer. Sorry, I thought it would just work like this, but TexLive 2011 is frozen.