I recently discovered gzipWTF, and am so glad I did. The tool, currently in beta, takes a look at a Web site and reports which resources are being compressed (using gzip, which browsers can decompress, among other formats) and which are not. As compression has an impact on your site’s speed, and is relatively simple to implement, this no-brainer verification tool ought to be run on everyone’s site. Just enter your site’s URL, fill out the CAPTCHA, and click the button to see the results. If there’s any resource that’s not being compressed, get your hands dirty on your site to fix the problem. The end result will be a site that loads faster for users, and could also mean better Google rankings, since performance is a Google criteria. Could not be easier!