Nielsen Company blog, the Nielsen Wire, reports that in the study they did measuring Post-E3 consumer purchase interest of a variety of software products, Halo: ODST was on top of the heap. The upcoming Halo 3 expansion scored a 53% rating. This was followed up by God of War III which garnered 49% interest. One surprising finding is that the Beatles: Rock Band only garnered 30% of post-E3 consumer interest.

The full list (with release date and % interest):
53% – Halo ODST (9/22/09)
49% – God of War III (March 2010)
45% – Wii Sports Resort (7/28/09)
42% – Guitar Hero 5 (9/1/09)
37% – Final Fantasy XIII (April 2010)
35% – Madden 2010 (8/14/09)
34% – Guitar Hero: Van Halen (12/1/09)
32% – Assassins Creed 2 (11/17/09)
32% – Need for Speed: Shift (9/22/09)
32% – Need for Speed: Nitro (10/17/09)
32% – NCAA Football 10 (7/14/09)
30% – Beatles Rock Band (9/8/09)

Via NielsenWire