Maybe we can break-up the blanket term of Web2.0 to understand what you're looking for in more

Once you break that down into specifics, you may have to compile the best practices of the
particular type of interaction type and then structure heuristics accordingly. 

Some places I'd recommend:

1. the "Patterns" section of IXDA's webpage ( 
2. UI-patterns

Those may be good places to start.

Good luck.

Daniel M.

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