for myself i rarely BUY any thing (metal gear solid stuff for littlebigplanet and ratchet and clank future: quest for booty) however, ive dled just about every free thing possible to c what its like. (almost every demo has a lil red bag beside it )

how about u? on a weekly basis how much would u say u download? 

Depends on the content, I usually download alot of things

Well I've bought 9 PSN games (actually bought 8 + Ragdoll Kung Fu).  The only DLC I've bought was all the Warhawk and SSHD stuff, and the MGS pack for LBP.  As for demos I download any that look interesting, and I'll pretty much give anything under 500MB a shot.

I've bought about ten games and DL a ton of free stuff

Demos, LBP, game videos/trailers, and free stuff.

i download lots of demos and trailers, and i have downloaded several psn games and some dlc for call of duty world at war.

Freebies and quite a few games.

I'm a big fan of the PSN/XBLA games this generation, so the majority of my purchases from the PS Store have been games and their expansions.

I do buy add-on content for title's I spend a significant amount of time on (ie map packs, LBP content packs, etc), and I make sure to download demos of games I'm interested in. I have also bought a few movies off the store, although that's not something I have done on a regular basis.

Quite a lot, I have bought a decent number of PSN games.

I downloaded Warhawk and Quest for Booty, because at the time no disc version was avaliable, but I did buy GT 5 Prologue

In terms of add on content, I have got a lot for LBP {inc MGS}, the Mirror's Edge map pack, some MotorStorm DLC and the Warhwak expansions

Free stuff mostly. Games are expensive enough as it is, I'm not going to pay for DLC since most of the time they don't amount to much.
That being said, I have purchased Flower and will also purchase Fat Princess when it comes out.