The industry term is "scope creep." The everyday human term is "a bunch of extra crap." One of the first few questions you answer when starting a web project is what are the core features. What's our site going to do for people? The simple answer you start with usually grows into a rambling monster of: instant personal messaging, event auto-recommendations, mobile video chat, holograms and real life status pokes.

Hey look the web is participatory and you're planning a site upgrade to use some of these new 2.0 features. In fact, you're so smart you're using a CMS/platform to harness some collective wisdom. But now how do you pick your features set? Let me guess, you told your developer "Everything," right? Maybe you looked at a list of about 45 potential features and checked
off 39 of them. That's what I'd do.

The blessings of a great CMS or plug-in feature (like addthis, sharethis, wimpy player, flicker badges, etc.) are also a curse. Functionality needs to be relevant. Simply put: diverting your focus will dilute the value of your site. It's tough to get excited about improving your core and perfecting user experience. But that's your bread and butter.