Are you the type who just can't bring him/herself to delete anime until you start getting those messages from your computer telling you it's had its fill? Or do you watch once, then delete, like a consciencious supporter of the industry?
Me? I usually have to first decide if it's a series where I'll have to watch any given episode more than once to follow the nuances of the story [see: FMA, Last Exile, etc.] or if the story's simple enough that I can watch once, then delete [see: Bleach, etc.]. Usually, if it's the former and I decide I don't want to shell out the big bucks for the dvds, I'll burn the episodes to disc at some point. Though there have been times when I've neglected to do this and regretted it later [I'm re-downloading RahXephon as we speak