CBR did their most recent poll and these are the results:
10 Geoff Johns’ “Green Lantern” – 812 points (24 first place votes)
9 Walter Simonson’s “Thor” – 887 points (19 first place votes)
8 Scott Snyder and Greg Capullo’s “Batman” – 1019 points (20 first place votes)
7 Grant Morrison’s “Batman” – 1036 points (22 first place votes)
6 Steve Ditko and Stan Lee’s “Spider-Man” – 1242 points (25 first place votes)
5 Jack Kirby and Stan Lee’s “Fantastic Four” – 1260 points (32 first place votes)
4 Alan Moore’s “Swamp Thing” – 1311 points (39 first place votes)
3 Frank Miller and Klaus Janson’s “Daredevil” – 1449 points (28 first place votes)
2 Neil Gaiman’s “Sandman” – 1474 points (40 first place votes)
1 John Byrne, Chris Claremont and Terry Austin’s “X-Men” – 2356 points (55 first place votes)
Edit: Cut and paste messed up the order there. Read it in reverse, X-Men is number one and Green Lantern at 10.