Can you put games purchased without steam onto steam?

[Allanon]

Does anyone know if you can get games that are on steam but that you purchased physically onto steam? For instance I have a lot of games that steam now offers and it'd be so much easier for me to put everything on my steam account.

[Flitterkill]

http://forums.steampowered.com/forums/archive/index.php/t-1388622.html

 

http://forums.steampowered.com/forums/archive/index.php/t-1650315.html