A couple of issues from someone with no prior Haskell/Eclipse experience.
I've installed Haskell Platform 2012.2.0.0, Eclipse 4.2RC3 and most of the optional components described at http://eclipsefp.github.com/install.html on my 64-bit Windows 7.
However, I had to add %USERPROFILE%\AppData\Roaming\cabal\bin to user PATH and some of these:
c:\Program Files (x86)\Graphviz 2.28\bin
c:\Program Files (x86)\GnuWin32\bin
c:\Program Files (x86)\Haskell\bin
C:\Program Files (x86)\Haskell Platform\2012.2.0.0\lib\extralibs\bin
C:\Program Files (x86)\Haskell Platform\2012.2.0.0\bin
c:\Program Files (x86)\Haskell Platform\2012.2.0.0\mingw\bin
to system PATH manually.
Then EclipseFP couldn't install scion-browser and some other stuff, until I've run Eclipse as Administrator.
Maybe these issues should be mentioned in the FAQ or "Extra installation steps".
Also it would be good to mention that EclipseFP integrates some sort of manual into Eclipse help system. A n00b like me feel quite lost after all installation stuff is done. I just didn't know where to start. EclipseFP provides a nice intro tutorial, but it's not provided or mentioned on the site. So a mere "now installation is complete, hit F1 to access EclipseFP's internal help for a quick tutorial and mini manual" would help at the end of "Installation" section.
I've added stuff to the install page and the FAQ page. Thanks!