Quoting oykie (Reply 10): According to Boeing.com Norwegian has ordered a total of 100 737800NG. Remember the strange order for 222 airplanes? Those 22 737800 got Norwegian's total 737800NG order up to 100.

OYKIE, the
LNDIx and
LNDOx are leased aircraft and were not ordered by Norwegian. Only the
LNNGx and
LNDYx series aircraft were those ordered by Norwegian and thus part of the Boeing.com listings...
Quoting oykie (Reply 10): So far so good. But when I search for deliveries to Norwegian on Boeing.com I only see 36 being delivered by March 2013. 
Norwegian 737800 CF 29Aug07 42
11 REMAIN
ON ORDER
39002 3231 Boeing 7378JP(WL)
LNDYD
39003 3401 Boeing 7378JP(WL)
LNDYE
39004 3482 Boeing 7378JP(WL)
LNDYF
39005 3572 Boeing 7378JP(WL)
LNDYM
39006 3583 Boeing 7378JP(WL)
LNDYN
39007 3665 Boeing 7378JP(WL)
LN
DYS
39008 3725 Boeing 7378JP(WL)
LNDYU
39009 3790 Boeing 7378JP(WL)
LNDYV
39010 3871 Boeing 7378JP(WL)
LNDYW
39011 3946 Boeing 7378JP(WL)
LNDYX
39012 3982 Boeing 7378JP(WL)
LNDYY
39013 4037 Boeing 7378JP(WL)
LNDYZ
39014 4067 Boeing 7378JP(WL)
LNNGA
39015 4090 Boeing 7378JP(WL)
LNNGB
39016 4157 Boeing 7378JP(WL)
LNNGC
39017 4234 Boeing 7378JP(WL)
LNNGF
39018 4289 Boeing 7378JP(WL)
LNNGG
39019 4295 Boeing 7378JP(WL)
LNNGH
39020 4343 Boeing 7378JP(WL)
LNNGI
39021 4371 Boeing 7378JP(WL)
LNNGJ
39022 4528 Boeing 7378JP(WL)
LN
NGK
39045 3530 Boeing 7378JP(WL)
LNDYJ
39046 3557 Boeing 7378JP(WL)
LNDYK
39047 3630 Boeing 7378JP(WL)
LNDYP
39048 3686 Boeing 7378JP(WL)
LNDYT
39049 4161 Boeing 7378JP(WL)
LNNGD
39050 4196 Boeing 7378JP(WL)
LNNGE
39162 2994 Boeing 7378JP(WL)
LNDYA
39163 3054 Boeing 7378JP(WL)
LNDYB
39164 3196 Boeing 7378JP(WL)
LNDYC
39165 3507 Boeing 7378JP(WL)
LNDYG
Norwegian 737800 CF 22Oct09 6
ORDER FULFILLED
40865 3410 Boeing 7378JP(WL)
LNDYH
40866 3432 Boeing 7378JP(WL)
LNDYI
40867 3565 Boeing 7378JP(WL)
LNDYL
40868 3591 Boeing 7378JP(WL)
LNDYO
40869 3651 Boeing 7378JP(WL)
LNDYQ
40870 3660 Boeing 7378JP(WL)
LNDYR
That totals 37 delivered aircraft out of the 100 ordered, leaving 63 on order.
The following block of aircraft have not had any deliveries yet:
Norwegian Norway Europe 737800 CF 19Jul2010 15
Norwegian Norway Europe 737800 CF 15Jun2011 15
Norwegian Norway Europe 737800 CF 24Jan2012 22