Final update:
I've rented out a server for a full year and configured the final version of the (fully working) bot. The username of that bot is "/u/goldcointip" and I've made a subreddit for it as well. This subreddit will host the tipping bots' wiki page - usage instructions, discussions about the bot itself, bug reports, and links to the various Goldcoin resources. I'll be building that out over the next little while. The subreddit can be found here:
http://reddit.com/r/goldcointip . There's nothing visible at the moment, but we should have some content later on.
As before, message the bot with "+register" in the body to get registered, then follow up with "+info" for your address. Deposit some coins and you can start tipping anyone in any thread. Just reply to the comment you want to give goldcoins to with "+/u/goldcointip x gld" where x is the amount you want to send. You can even replace x with some fun values like "beer" or "leet" or "pi". All these will be added to the wiki soon.
If, when you register (or tip someone) with the bot you don't get a reply back, don't worry. The bot is working, but the first bunch of replies have to be manually approved because of reddits' CAPTCHA system. I'll have to input captchas manually until the bot gains positive karma at which point it'll be fully automated. So, uh... get those upvotes going

Thanks to everyone who helped test the previous versions.