Typically when you set out to build a RIA (Rich Internet Application), you look at what data you're about to keep about a persons account. In that obviously "Username, Password and Email" are three key pieces of information you need to begin. The rest is the other metadata associated to an account, and in CRM's you'd go deeper in terms of phone numbers etc.
The data is up to you and I'd never dictate what you should and shouldn't capture. What I am focused on is how you present that data, in that how "Rich" do you want the experience to be in terms of presenting what is probably the most boring data in a RIA.
I'd wager majority use Tabs + Forms and basically categories this into neat portions that are close to being semantically correct (in terms of which heading they fall under - look into information architecture).
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