Showing the number of Bitcoins available is on my TODO list. I just checked and the balance is up to 1,135 (thanks to whoever donated!).
And right now it is 5 bitcoins per IP address (not bitcoin address). Not per-day-- just 5. I want to start out conservatively, I will loosen it to 5 per (day?/week?/month?) if people start having lots of trouble because they get a dynamic IP address from their ISP that already got some.
RE: captchas: yeah, I was gonna start out with a captcha, but I wanted it to be as simple and non-threatening as possible. I don't think anybody who has access to hundreds or thousands of working public IP addresses would go to the effort of writing a bitcoin-harvesting robot, though I suppose somebody with a botnet might take a crack at it. To make that tougher I could make it 5 bitcoins per IP AND 5 bitcoins per bitcoin address (so they couldn't have all the bots in the botnet using the same BC address).