I haven't yet upgraded our website to 1.8 as it is fairly complex. It is based on the Elle Theme. (http://www.momsdadsandkids.com)
When I was doing some cleanup prior to upgrading, I noticed two references to Gravity Forms, and two references to MailChimp in Appearance. In each case, one is activated and one is not. That said, when I checked the files via FTP there was only one directory for each.
I'm nervous about upgrading to 1.8 thinking there could be some underlying glitch that's gonna take my whole site down. Any advice?