Finally, a captcha you can't read...wait...that's not what I meant... This is the captcha you don't even need to see.
Search engines limit the amount of text in each SERP result. Meta Character Count displays a live word and character counter for the title, description and keywords fields in Joomla Global Configuration, Content Categories and Articles (frontend and backend) and now also Menu items!
Set (and optionally require) minimum browser versions for your site. Using this plugin, you can display a warning message that the users browser is outdated, along with a suggestion that they update (or install) a browser that meets your requirements.