"this is a clever idea that I think might work well"
"I haven't had a single comment spam in my comment moderation queue for over a week now. I'm feeling the love!"
"The least annoying one I have found"
"this thing was a trivial install"
"a fancier technique"
"Comment Spam is a thing of the past, and I owe it to Spam Stopgap Extreme. If you use WordPress, I highly recommend installing this plugin. It has completely eliminated the comment spam problem I was having. I no longer need the spammer Tarpit plugin, or anything."
"Why am I not worried about comment spam anymore? Because of my awesome new blog plugin, Spam Stopgap Extreme. This baby blocks any bot trying to post to my blog. No blacklists, no moderation, no 'spam points', no nothing. You won't even know that it's working."
"I haven't had anything to 'deal' with in several weeks. That's a nice thing. I've also had a bunch of folks leave legitimate comments that have gotten through. It's all good."
Change Log
WP Hashcash 4.1
Added a new options page under Options, Wordpress Hashcash
Fixed XHTML standards compliance
Added validation options for pingbacks and trackbacks (stolen from here)
Added a logging option for moderated comments
WP Hashcash 4.0.5
Added an option for handling comments via moderation, the akismet queue, or deletion
Removed database dependencies
Removed error message for hash fail
Added the noscript tag for users without javascript
Corrected the widget formatting
Changed zip file format from winrar to 7zip, hopefully it will be more compatible
WP Hashcash 4.0.4
Removed version checking
Removed an unnecessary link element in the head section
WP Hashcash 4.0.3
Suppress errors on loading remote version by any method
Fix typo-bugs everywhere affecting the widget reporting, date checking, etc
Strip tags from remote version
Try various methods to get remote version, ignore if we can't open sockets