Intercepting paths

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Hi all. I'm new to concrete here, so please understand if this seems like a silly question. I have a need to intercept requests for given paths and redirect them elsewhere, either from within concrete or before concrete gets hold of them. For instance:

http://mysite.com/firstalias might redirect tohttp://www.ibm.com/
http://mysite.com/anotheralias might redirect tohttp://www.example.com/somepath/subdirectory/page.html...
and maybe
http://mysite.com/thirdalias might redirect tohttp://www.youtube.com/dukedevelopment...

The point is, we want short urls on our site (usable in print publications, for instance) which can redirect the user to a potentially much-longer url on a different site.

What's the best way to create such a thing within the concrete5 framework? Is there a way to do it within concrete, or does it need to be done at the apache level before concrete sees it (within .htaccess or something)?

Thanks!
Peter