I just installed the .dmg fore the Haskell platform. 
When I run "cabal update" in terminal I get the following:

Note: there is a new version of cabal-install available.
To upgrade, run: cabal install cabal-install

I then ran "cabal -V":
cabal-install version 0.8.0
using version 1.8.0.2 of the Cabal library 

The latest version of cabal install is 0.8.2.  When I run "cabal install cabal-install" it seems to work fine, without any errors but when I go back and check i.e. "cabal -V" i still get version 0.8.0.  

I tried "cabal list cabal-install":
   Synopsis: The command-line interface for Cabal and Hackage.
    Latest version available: 0.8.2
    Latest version installed: [ Not installed ]
    Homepage: http://www.haskell.org/cabal/
    License:  BSD3

What am I missing?  It is really annoying that cabal update keeps telling me about a new version of cabal-install that I can't actually get to work!

Thanks 
Rohit