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2007 is the year of the sequel in cinema. The number of trilogies(5) has to be a record. Here's a list of repeat offenders coming to a theater near you.

Dupes
Fantastic Four: Rise of the Silver Surfer (This is actually the third FF movie if you count the 1994 Roger Corman backed film.)
28 Weeks Later (Could 28 Years Later be far behind?)

Triads
Pirates of the Caribbean: At World's End
Spider-Man 3
Shrek the Third (A fourth Shrek movie and a Puss in Boots spin off are already in the works)
Ocean's Thirteen (According to director Steven Soderbergh there will not be a fourteen.)
Rush Hour 3 (There was a Rush Hour 2?)

One side of the triangle
The Golden Compass (Barring a box office bomb, this is the first chapter in Philip Pullman's "His Dark Materials" trilogy)

Pentagon headed for a heptagon
Harry Potter and the Order of the Phoenix (This is the 5th Potter movie, a 6th book is already in the bank & another is due in the near future.)