Hey solareclipse, did you ever resolve this question? I'm in a similar situation and am trying to work out whether I should try and renew my temporary residency.
I am about to leave Chile for 2 months, during which my temporary residency will expire, but am planning on returning to Santiago in August for another 2 months, with the intention of then coming back to live in Chile more permanently later in 2011. (I travel a lot - its very complicated

) I'm not sure if/how its possible to extend the temporary residency, or if it would be better to come back in August under a tourist visa, and apply for another temp res visa later in 2011.
How did you get on with your situation?