I posted almost a month ago about all the searches that I've been noticing on my blog about gacutil.exe. I believe I've determined the question that at least some of the folks are wanting to ask. Folks don't know where to get it.

gacutil.exe and other tools such as ildasm.exe are part of the .NET Framework SDK. The .Net Framework admin tool, which used to be part of the redist, is now part of the SDK.

There may be some confusion around gacutil in particular. It has never shipped with the redist, but apparently a servicing package of the redist in the Everett (v1.1) timeframe used it as part of its servicing logic (oops) and didn't properly clean up after itself (double oops). As a result, there may be developers out there that have gotten used to gacutil being in the framework directory. If that's the case, we're sorry for giving the wrong impression. gacutil is intended to be a developer-only tool, used as part of development.

Instead of using gacutil at deployment time (as our not-so-smart servicing package did), you should use MSI or code against the fusion APIs yourself (with the former being the preferred method). For more info, you might take a look through Junfeng's blog.

Happy GACing.