I had a bit of a chuckle at your question, raj. You are hoping for a LOT of technically precise information from a gathering of webmasters who are in a situation pretty much like you. The Google engineering staff doesn't hand out this kind of data to the likes of us.
It's a real challenge to know what type of search results any Google clicks come from. You can get some kind of a guess from the new Webmaster Tools data. If it shows a result that is usually in the top three, but sometimes impressions are credited to deep search result pages, then there's a decent chance those come from some kind of a revised search option.
I'd say a lot is going to depend on the nature of the site and the user intention behind the query term. For a product oriented site, you'll see more from Shopping. For a local business, you'll see more from Maps. For a time-sensitive website, you might see more from Blogs. I doubt there's going to be anything like a universally usable rule of thumb.