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For what i know, RCs is the amount of mana you can use to vote, post, redeem rewards or any interaction with the blockchain... Voting mana really doesnt exist, just voting power, although your RCs (mana) is consumed every time you vote also... The more steem power you have, you have more recourse credit (mana)... Its almost the same than before, just that no one cared about bandwidth because that rarely got consumed (just for very rare cases for users with very low steem power)... Now seems like mana get consumed very quick... we just have to wait to see how this develops...

Good explanation. A part I want to elaborate a bit about is this though:

The more steem power you have, you have more recourse credit (mana)... Its almost the same than before, just that no one cared about bandwidth because that rarely got consumed (just for very rare cases for users with very low steem power)

While having issues with the bandwidth was rare in the last few months, it used to be a huge issue. Back when Steem was $6, the activity on the blockchain was a lot higher, and pretty much everyone with less than 50 Steem Power could not properly use the blockchain at all. They could vote on a few things, make a few comments, and then they would have to wait.

This is also the reason why the system was changed to RCs, which could give people a more predictable measurement as to what they could do on the blockchain, instead of the seemingly random bandwidth system.

But I - with 700 free SP and 30% RC and billions of mana- could not even do a delegation transaction today to help a minnow. I need a price list of each action soon!

Yeah, it was pretty bad, but it should be a bit better by now. You can also see a list of all the actions you can performm over at http://steem.supply/@goldrooster. I don't think a price list would be really effective, since the cost of the actions will change all the time.