Redirect in SharePoint

Two good articles on the subject, depending on your needs.  On thing to mention, I used a link to a text file instead of putting the code directly into the web part.  This gives me a back door so I can change the settings on the page without having to open the page in designer (or having to quickly edit the web part before the redirect, as one commenter mentions.)

Redirect a SharePoint site by using the Content Editor Web Part

Redirect in SharePoint Using Meta vs JavaScript