Shouldn't be that hard really, should it?

Now add project server into the bunch and it truly becomes a disaster

From my count though you need the following

5 - Windows 2003

2+ - SQL 2005 (depending on how you license it and how beefy the machines are - possibly 8 SQL licenses per box or 2 SQL licenses and 900 CALs)

3 - MOSS 2007 Enterprise

900 - MOSS Enterprise CALS

900 - MOSS Standard CALs

3 - Visual Studio

3 - Office SharePoint Designer

3 - Infopath 2007

x - Office 2007 for anyone that then determines they want to use excel services :)

Am I close?

In addition to what SameBoat said you would need the same server licences for the acceptance environment (provided you really want a 1-to-1 mirror AND two more 2003 licenses for the host machines of the virutalization (provided you were using Virtual Server 2003 R2).  You would not need the 900 CALs for the acceptance environment provided your users only access the production environment.  You would need at least 3 CALs (standard and enterprise for MOSS) for your developers).  And if your used Virtual Server 2005 then you would only need 2 SQL server licenses w/ CALs for your developers since your virtual machines can only give you access to one processor.

At this point Microsoft Licensing (at least Open License although an enterprise license should be considered) would be benifitial along with some MSDN licensing which could be used for your acceptance environment if it also was your development environment.