>My solution contains only an asp.net project. This project has references to several DLLs that have their own projects. It sounds like the best way to do this is to add those other projects into my asp.net solution and reference those projects.
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>You also mentioned looking at the project's Dependencies and the Build Order Tab. I can't find either of those menu options anywhere in my environment. What do I have to do to see these menu options?
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If you right-click on the Project itself (not the solution), you should see "Project Dependencies". If you don't, if you've got a "Property Pages" option instead, you're probably using a Website project, which doesn't actually have all the same options as a "Web Application Project". I (thought) Website projects normally auto-updated DLL references that aren't in the GAC when you rebuilt the project. But I have virtually zero experience with website projects - I didn't bother converting to VS 2005 until they had reinstated the web project model because "Website projects" broke my apps and have pretty much used them exclusively.