Can I keep ANY of the free stuff I received as a PS+ subscriber if I no longer subscribe?
YES! Avatars, themes and minis will not expire when your subscription expires.
I've heard some DLC also sticks around after your subscription ends. Tough for them to put their expiration date thing on DLC, I guess. Although I haven't seen free DLC as part of PS+ in a long time.
Also worth noting is that different regions offer different games for PS+. Lately a lot of people have been complaining that US is getting shafted compared to EU. For advance notice of what's on the way, check:
http://blog.us.playstation.com
http://blog.eu.playstation.com
You've also completely left out the non-store benefits. PS+ lets you configure your PS3 to automatically update everyday at a set time. This downloads and installs any system updates, software updates for games you play, software updates for apps like the store too, as well as anything you have queued up to download. It also syncs trophy data, and backs up your latest saves to the cloud.
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