With the release of Windows 7 and Windows Server 2008, 64-bit is becoming more popular. However, at this time we do not have any plans to release a 64-bit verison of ITScriptNet. Why?
First of all, the 32-bit version runs fine on all 64-bit Windows operating systems. Windows has a 32-bit subsystem for running on ^4-bit machines.
Secondly, there isn't any advantage (yet) to moving to 64-bit. The primary advantage of a 64-bit OS over 32-Bit is the larger memory size. However, as of now we are not having any trouble fitting into a 4GB address space.
Third, there are actually disadvantages to moving to 64-Bit. There is actually a small performance penalty associated with the larger register size using more of the processor cache. There is also the time associated with actually performing the conversion. Right now, we feel our time is better spent adding new features and improving ITScriptNet. For a slightly technical discussion of this topic, here is a blog entry about why Microsoft has not yet ported Visual Studio to 64-bit either.
This isn't to say that there are no issues to be aware of. In fact, we have posted a Knowledge Base article about two of the 64-bit concerns, ODBC Data Sources and .Net Assemblies.
We will continue to monitor progress in this area, and in the long run a 64-Bit port will probably need to be done. However, in the short term you can continue to use ITScriptNet safely on all flavors of Windows.