For me, I think the greatest change for the new web, is tools. Cool tools to be precise. Being able to use tools at a web 2.0 site that enables you to achieve many things is awesome. Things that make every day life easier.
Because my new world of parenting and technology has collided I am forever wishing for all my favorite things being in a logical and organised format, able to be accessed from one page. I have found it, and it's called Cingo!!!! The site aggregates personalised data into tabs. The main areas are "My homepage", Bookmarks, calendar, webmail, but what makes this site exciting is that the subsequent tabs have news, movies, travel, shopping, grocery list and the interface at each tab is a playground for pods, or widgets, (little areas of presented data that you can customise). I do personally think they should have a tab on Parenting Advice from Minti in RSS format of customisable article topics (of course I would say that, I am one of the co-founders of minti)
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Back to user interfaces, I do strongly believe user interfaces need to offer something more than just information. The user interface (what you see and experience when visiting a website) needs to be interactive. It's great if sites focus on this core aspect of social networking, by offering RSS feeds (ability to subscribe to topics you want to), tag clouds (keywords relevant to the topic, more the keyword is attached to the topic, the larger the keyword gets and you can sometimes click on the tags to find the relevant content), ajax (registers changes without having to reload the page again), ability to add content and contribute, you are using the site more that just logging in or searching. I think it adds a 'fun factor'. The more fun you have, I believe the site's offering has really understood it's users.
Being able to subscribe to the content, cool community tools once you become a member, like at Cingo enhances the social aspect of not only interacting with the site (or user interface) but you also enhance that sense of belonging and feel compelled to interact with other members.
More family sites see my blog on Talking Tech on Family 2.0…Info on explaining the new web, "the truth about Web 2.0" by Paul Graham and "Wired's worse story comes true" and "Web 2.0" by Paul Boutin. Cool sites being talked about everyday, see "Techcrunch" by Michael Arrington.