I think most of us are still a bit confused about the Resource Credits (RCs), and exactly how many RCs you need to do a single action. This system seem a bit complex right now, but I'm sure we will all get used to it soon enough.
I have seen people wanted to get a number for what it cost to publish a blog post, a comment, or an upvote, but there is not clear answer here. The exact cost will depend on the current load on the blockchain, meaning that it will be cheaper to post/transact when there is fewer people who are currently transacting to the blocks.
This does not mean that you cannot get an okay overview of what you can expect from your RCs though, and once again the witness @dragosroua comes to save the day. He has updated the website http://steem.supply to show not only your RCs, but also to show you roughly how many posts, votes, and transactions you can do before you need to recharge.
To see your profile, use the link http://steem.supply/@username, but change "username" to your own username. As you can see from the screenshot above, the number of actions you can perform on the blockchain is right below your profile picture.
I obviously have a lot more RCs compared to what I actually need, so it's nice to at least be able to post without having to worry about this. But even if you have less Steem Power; at least it's nice to know exactly how much you can do before having to recharge. And remember that you recharge superfast now after one of the updates to the hardfork, so now you get 200 % in a single 24 hour period compared to the normal 20 % per day that was intended.
How are new users doing?
As expected the amount of actions you can do depends on your Steem Power, and it seems like minnows and plankton users are still in a bad place. One of my alt accounts with 6 Steem Power can only do a single post or comment before having to recharge the RCs, so we need these actions to be a lot less expensive in the future if we want to have new users on this blockchain.
It's important to keep in mind that this system will eventually stabilize by itself, and it might take a week or so before we get to the spot where actions are priced correctly. So there is no need to panic if you cannot do enough actions right now; it will most likely fix itself soon enough.
Anyway, if you find steem.supply to be a good tool (it has a lot of other nice features besides just seeing your Resource Credits), then I'm sure @dragosroua would love for you to consider him as a witness. He's currently in place 55, but he deserves to be a lot higher in my opinion. So please consider giving him a vote if you find this tool to be useful.