How to show an asp.net User Control on a Sharepoint page

1. Create a directory to hold the user controls on the sharepoint server under C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\CONTROLTEMPLATES
2. Move the user control into this directory, this can be uncompiled source code.
3. Using Sharepoint designer, create a page to display the user control.
4. Add the user control to the page you created with Sharepoint Designer the same way you would add any user control to a asp.net page.

That's it. Then you should be able to load this page in a browser and display the user control.