There are 32-bit and 64-bit version of all of SQL Server 2000, 2005 and 2008.
The 64-bit version of SQL Server 2000 is for database services only, most other components run only at 32-bit.
There are some 64-bit restrictions in SQL Server 2005 - the main one I know of is that AMO (Analysis services Management Objects) run only in 32-bit but can manage a 64-bit instance of SSAS. Also, last time I looked I could not find a 64-bit version of SQL 2005 Express with Advanced Services on the MS download site.
There are no 64-bit restrictions with SQL Server 2008 that I know of.
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Disclaimer: All information provided is a personal opinion that may not match reality.
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