I have a fear if Google realised your page was using this it could really damage your ranking.

Wow Ted. Great hack!

Excellent. :).

Attention :

s. Screenshot - this is happening after Installation of this Hack.

Most Yahoo IP´s are blocked.

That's certainly possible. However, many sites (i.e. webmaser world, new york times, barons, wsj, etc...) do just this... and do it with Google's knowledge. In fact, Google has a product that logs in to protected sites and from what I've been told, will be rolling this out to more sites in the future.

Keep in mind that you are not showing different content to a user any more than Amazon shows people who have logged in different content than those that have not. Most dynamic sites these days show different content to different groups -- the welcome message on your forumhome template, showing birthdays or announcements to one group, or ads to another. In this case, all you are doing is limiting the number of times a guest may view pages. I can't tell you what this will or won't do for the SERPs, I can tell you why it makes sense and what others are doing that's similar.

It looks like Yahoo's agent was a little different than what my filter had. Try updating the plugin file and let me know if you see any issues.

Sorry, Ted after your other Answer about Google i have to uninstall this. If Google uses Login Agents it will only do it at Major Sites and that are not the most Sites. ;)

Nice Idea - but Crawling is more important for me than force Guest to register. ;)

awesome mod ted s.......works perfectly

Ted, quick question on bot's?

If you want certian bot's to come to your site, say Yahoo! Slurp Spider or FeedFetcher-Google Spiders.........where do you add these? I see Would it be something like

K, i have to disable this for now.......redlabour is right, it is kickin off the bot's for those that need to have them on.

I will keep checking back on this post tho, this is a great idea.