This Twain hero is going to the territory because he doesn't want Aunt Sally to civilize him

Agent K,
Agent J,
Jack Jeebs

You can use your iPhone as one of these that'll show you where magnetic north is

Centennial

A surface on which pictures are projected for viewing

In this Orwell book, looking from pig to man & man to pig, it's impossible to say which is which

Brian O'Conner,
Johnny Tran,
Dominic Toretto
(it's the first movie)

Don't know the name of a song? Use Midomi or this app, whose logo is seen here
http://www.j-archive.com/media/2009-11-02_J_30.jpg

Triennial

Brooke Mueller is the latest wife to try & tame this sitcom star

In his "The House at Pooh Corner", "A little boy and his bear will always be playing"

Carl Fredricksen,
Charles Muntz,
Russell

Several apps are available to test this, IQ for short

Septennial

To remove a young mammal from breast feeding

He wrote, "It is not often... someone comes along who is a true friend and a good writer. Charlotte was both"

Holly,
Matt Lauer,
Chaka

Lex, seen here, is the title character of this word game
http://www.j-archive.com/media/2009-11-02_J_26.jpg

Quadricentennial

To swerve a car dangerously from side to side

In this Norton Juster novel, Milo wants to drive his car through the title entry but it's gone because others need it

Link Larkin,
Amber Von Tussle,
Wilbur Turnblad

You can figure out square roots & find coordinates on the x- & y-axes with the app called "Graphing" this

Novennial

Once used in corsets, it's a jaw material from certain whales