In-Brief: Consider this (the last in this week's trilogy of iPhone posts) a place-setter for the news we're likely to see later this month from Taptu, a provider of socially-assisted search I have had high on my radar since it broke on the scene just over three years ago. Look for a new service focused squarely on enabling mobile search across touch devices, and a short private beta before it launches in the Apple Ap...

Some great stuff to add to your required reading list: The Netsize Guide 2009 and three new mobile search white papers (two live -one slated for release following Mobile World Congress), all focused at some level on the extraordinary impact of iPhone on our search behavior). A highlight: Some surprising stats on search volume and a sneak peek at a Google's voice search performance. Gearing up for a whirlwind week...