If you're an ASP.NET or SharePoint developer, SmartPart for SharePoint is an active project out on Gotdotnet Workspaces that is definitely worth a look. Yesterday, Jan Tielens, one of the workspace owners, released Son of SmartPart v1.0.

Son of SmartPart (download under Releases) enables you to run ASP.NET 2.0 UserControls and WebParts in SPS 2.0! For the attention-impaired, like me, Jan posted an instructive screencast of the setup steps required to use Son of SmartParts on your SharePoint.