Between January 1st and today (rounded to the closest 1000):
http://lesswrong.com/r/discussion/new/ had 378 000 unique views
http://lesswrong.com/promoted/ had 71 000 unique views
http://lesswrong.com/new/ had 26 000 unique views
http://lesswrong.com/r/discussion/ had 23 000 unique views
http://lesswrong.com/r/discussion/comments/ had 11 000 unique views
http://lesswrong.com/comments/ had 9000 unique views
http://lesswrong.com/r/all/recentposts/ had 6000 unique views
Most-read open threads (rounded to the closest hundred):
http://lesswrong.com/r/discussion/lw/lk6/open_thread_jan_19_jan_25_2015/ had 1400
http://lesswrong.com//r/discussion/lw/lov/open_thread_feb_9_feb_15_2015/ had 1300
http://lesswrong.com/r/discussion/lw/m37/open_thread_apr_20_apr_26_2015/ had 1300
http://lesswrong.com/r/discussion/lw/lli/open_thread_jan_26_feb_1_2015/ had 1100
http://lesswrong.com/r/discussion/lw/lw5/open_thread_mar_16_mar_22_2015/ had 1100
http://lesswrong.com/r/discussion/lw/m40/open_thread_apr_27_may_3_2015/ had 1100
http://lesswrong.com/r/discussion/lw/lnc/open_thread_feb_2_feb_8_2015/ had 1100
http://lesswrong.com/r/discussion/lw/m64/open_thread_may_11_may_17_2015/ had 1100
http://lesswrong.com/r/discussion/lw/m0g/open_thread_apr_06_apr_12_2015/ had 1000
http://lesswrong.com/r/discussion/lw/m1p/open_thread_apr_13_apr_19_2015/ had 1000
http://lesswrong.com/r/discussion/lw/m52/open_thread_may_4_may_10_2015/ had 1000
http://lesswrong.com/r/discussion/lw/lj1/open_thread_jan_12_jan_18_2015/ had 1000
http://lesswrong.com/r/discussion/lw/mcj/open_thread_jun_15_jun_21_2015/ had 900
http://lesswrong.com/r/discussion/lw/mdh/open_thread_jun_22_jun_28_2015/ had 900
http://lesswrong.com/r/discussion/lw/mgr/open_thread_jul_13_jul_19_2015/ had 900
http://lesswrong.com/r/discussion/lw/mjd/open_thread_jul_27_aug_02_2015/ had 900
(somewhat bizarrely, http://lesswrong.com/lw/28l/do_you_have_highfunctioning_aspergers_syndrome/ had 41 000 unique views, narrowly beating lesswrong.com/message/inbox/ ; and http://lesswrong.com/lw/ihw/advanced_placement_exam_cutoffs_and_superficial/ had 35 000 unique views, beating /r/discussion )
Between January 1st and today (rounded to the closest 1000):
http://lesswrong.com/r/discussion/new/ had 378 000 unique views
http://lesswrong.com/promoted/ had 71 000 unique views
http://lesswrong.com/new/ had 26 000 unique views
http://lesswrong.com/r/discussion/ had 23 000 unique views
http://lesswrong.com/r/discussion/comments/ had 11 000 unique views
http://lesswrong.com/comments/ had 9000 unique views
http://lesswrong.com/r/all/recentposts/ had 6000 unique views
Most-read open threads (rounded to the closest hundred):
http://lesswrong.com/r/discussion/lw/lk6/open_thread_jan_19_jan_25_2015/ had 1400
http://lesswrong.com//r/discussion/lw/lov/open_thread_feb_9_feb_15_2015/ had 1300
http://lesswrong.com/r/discussion/lw/m37/open_thread_apr_20_apr_26_2015/ had 1300
http://lesswrong.com/r/discussion/lw/lli/open_thread_jan_26_feb_1_2015/ had 1100
http://lesswrong.com/r/discussion/lw/lw5/open_thread_mar_16_mar_22_2015/ had 1100
http://lesswrong.com/r/discussion/lw/m40/open_thread_apr_27_may_3_2015/ had 1100
http://lesswrong.com/r/discussion/lw/lnc/open_thread_feb_2_feb_8_2015/ had 1100
http://lesswrong.com/r/discussion/lw/m64/open_thread_may_11_may_17_2015/ had 1100
http://lesswrong.com/r/discussion/lw/m0g/open_thread_apr_06_apr_12_2015/ had 1000
http://lesswrong.com/r/discussion/lw/m1p/open_thread_apr_13_apr_19_2015/ had 1000
http://lesswrong.com/r/discussion/lw/m52/open_thread_may_4_may_10_2015/ had 1000
http://lesswrong.com/r/discussion/lw/lj1/open_thread_jan_12_jan_18_2015/ had 1000
http://lesswrong.com/r/discussion/lw/mcj/open_thread_jun_15_jun_21_2015/ had 900
http://lesswrong.com/r/discussion/lw/mdh/open_thread_jun_22_jun_28_2015/ had 900
http://lesswrong.com/r/discussion/lw/mgr/open_thread_jul_13_jul_19_2015/ had 900
http://lesswrong.com/r/discussion/lw/mjd/open_thread_jul_27_aug_02_2015/ had 900
(somewhat bizarrely, http://lesswrong.com/lw/28l/do_you_have_highfunctioning_aspergers_syndrome/ had 41 000 unique views, narrowly beating lesswrong.com/message/inbox/ ; and http://lesswrong.com/lw/ihw/advanced_placement_exam_cutoffs_and_superficial/ had 35 000 unique views, beating /r/discussion )