320 x 240 is landscape view e71 , e63 , e61 , e61i  etc etc

240 x 320 is portrait view = n95 8gb, n85,n79 etc etc

First thing you should know that N78 is the worst among them,,,
- its 3.2mpx camera with a LED flash...
- other thing is normal in Nseries phone.. - Ngage,WLAN , GPS with A-GPS...
- S60 FP2

N79
- 5mpx phone with dual LED flash
- nice camera and video quality
- S60 FP2 , newer feature pack.. better than FP1[in interface]
- XpressON Covers[change theme automatically when changing cover]
- other thing is same like newer Nseries has[WLAN,GPS with A-GPS , Ngage..etc...
N82
- 5mpx with xenon flash
- nice camera quality
- S60 FP1
- older but wiser[cheaper,wiser than buying N78]
- other thing that Nseries have.. WLAN,GPS with A-GPS, Ngage.. etc...
the specs also almost same but :-
N79
- is using Symbian OS 9.3 with S60 3.2 UI[S60V3FP2]
- has XpressOnCovers[can change back cover,everytime you change the back cover.. the theme will changed too..]
- has nice interface[new Feature pack]
- 5MP camera , with autofocus , LED flash 2nd generation
- has FM transmitter

so when comparing N79 and N82..
- N79 better in video recording[at night[with LED flash helps] and day too]
- N79 has nicer interface[i mean the UI]
- N79 has XpressOnCovers,nice
- N79 has FM transmitter[can hear mp3 at radio,just transmit it from hp]
- N82 better in taKing photos[because of Xenon Flash too]
- N82 has 3D grapic accelerator[actually not much diff]
- N82 has better processor[actually not much diff too]
N79 is newer and N82 is older.. but the price is almost same
both - RM 990 - AP
N79 - RM 1150 - ORI
N82 - RM 1100 - ORI

the nearest competitor for N79 is N85
N85
- same OS and FP with N79
- 5MP camera , with autofocus , LED flash 2nd generation
- has FM transmitter
- using Active Matrix OLED[AMOLED] screen - the most beautiful,brilliant screen[lol]... and it saves battery a lot
- slide and stylish phone
- the rest all the specs almost same with N79[except for xpressoncovers]

N85
- RM 1280 - AP
- RM 1400 - ORI