The other is HTTPS - for improved security.
Both these things happen on the back-end, and don't require you to do anything special. The site should just run more smoothly during peak times, and provide you with a more secure connection whether you visit the site on a computer, tablet, or smartphone.
Big thanks to Backbone and the rest of the Tech Team, the rest of the mod team (who helped out with testing), and everyone on the site for having a little patience with us (and entering CAPTCHA codes during every login) when there were a couple hiccups along the way.
If you experience any technical problems with the site, you can send me a private message or post about it here. Thanks!