There have been various attempts over the years to create a true BIM portal, with links to all relevant documentation.  Have you checked out CODEBIM?  The reports page is pretty impressive list of BIM documents …

Heads-up:

Watch this page – pretty soon, the Australian and New Zealand Revit Standards (ANZRS) will be available for download…

The ANZRS document pack is not yet available for download. It will be made available within 2 weeks subsequent to its launch at the 2011 Australasian Revit Technology Conference, 26-28 May at Jupiters Gold Coast. Please come to the launch and/or revisit this page after that time.

From
Download the Pack! | anzrs:

Interesting undertaking to develop a new RFO Style Guide (RFOSG), to enhance the possibility of sharing content – over at the Revit Forum.

Here is the latest PDF version:
Revit Style Guide v0.2 pdf

And here is a sample of some of the contents:
Naming Conventions     4
Separators and Case     4
System Families     4
Loadable Families     5
Materials     7
Fill Patterns (Surface)     8
Fill Patterns (Cut)     8
Line Patterns     9
Line Styles     9
Line Weights     9
Text Styles     9

It is also in a nice ‘open’ format:


This document is developed and released under the Creative
Commons with Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
(Commonly referred to as “CopyLeft”)
You are free:
to Share – to copy, distribute and transmit the work
to Remix – to adapt the work 

via
Revit Style Guide – First Draft

There is some very handy BIM resources located on the Indiana University website at http://www.indiana.edu/~uao/iubim.html

Among other things, you can download the IU BIM Guidelines and Standards for Architects, Engineers, & Contractors document.

There are also some very handy links to other BIM resources.

Thanks to James Van of ArchTech for posting this one.