Oh damn I've never really looked at PS+ hard before.
I have a couple questions about it.
Once games leave the 'instant game collection' do existing PS+ users still have access to that title?
And do you need to download or otherwise press a button on the store for all the weekly/monthly content to have access to it on your account after it rotates out? Or say I get PS+ now and a Vita in a year, I'd still have access (in my account history I guess) to anything that was ever free on PS+ for it?
Yes, you still have access so long as you took it through the checkout. If you DIDN'T take it through the checkout then no, no access for you.
All the time you have a sub, you have access to everything you put through the checkout. Amazed at how often this comes up.
And as I said in the Vita thread, the new Browser being open while you game will be a godsend to many RPG players who want a guide handy!