Best way to share ASP.NET .ascx controls across different website applications?

Question

Suppose you have 2 different ASP.NET applications in IIS. Also, you have some ASCX controls that you want to share across these 2 applications.

What's the best way to create a "user control library", so that you can use the same control implementation in the 2 applications, withuot having to duplicate code?

Controls have ASCX with HTML + code behind.

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Composite controls will be difficult, because we work with designers who use the HTML syntax in the ASCX files to style the controls.

Tundey, we use SVN here. Do you have an example on how to implement your suggestion? How can SVN share the ASP.NET controls?

Thanks!