Note: This is a really old post transferred from Laurii for historical and consolidation purposes.

To make things a bit easier than looking at three parts, I'm combining everything in a single (huge) table. Enjoy!

Galaxy S II Galaxy Nexus Galaxy Note
Samsung-Galaxy-S2-150x150 Samsung-Galaxy-Nexus-150x150 Samsung-Galaxy-Note-150x150
Generic Band Quad, WCDMA Quad, WCDMA Quad, WCDMA
Weight (g) 116 135 178
CPU Type Exynos 4210 TI OMAP 4460 Exynos 4210
CPU (GHz) 1.2 1.2 1.4
GPU Mali 400MP Pover VR SGX540 Mali 400MP
Battery
Battery(mAh) 1650 1750 2500
Talk 2g 18.3 ? 26
Talk 3g 9 ? 13.5
Stand by 2g 710 ? 960
Stand by 3g 620 ? 820
Screen
Screen size 4.3 4.65 5.3
Screen type S AMOLED Plus HD S AMOLED HD S AMOLED
Screen resolution 800x480 1280x720 1280x800
Glass Gorilla Fortified Gorilla
OS version 2.3 4.0 2.3
Upgrateable to ICS Yes - Yes
Memory RAM (GB) 1 1 1
Memory FLASH (GB) 16 No 16
SMS Yes Yes Yes
MMS Yes Yes Yes
Swype Yes Probably Yes
Email Yes Yes Yes
IM Yes Yes Yes
Social Networking Yes Yes Yes
Exchange ActiveSync Yes Yes Yes
Social Hub Yes Maybe (Samsung app) Yes
Bluetooth 3.0 Yes Yes Yes
Bluetooth 3.0 HS Yes Yes
USB Tethering Yes
WLAN a/b/g/n a/b/g/n a/b/g/n
WLAN Tethering Yes Yes Yes
Wi-Fi direct Yes Yes Yes
NFC Some Yes No
AllShare Yes Yes
EDGE Yes Yes Yes
GPRS Class 33 Yes Yes
HSUPA (max MBit/s) 5.76 5.76 5.76
HSDPA (max MBit/s) 14.4 14.4 14.4
HSPA+ (max MBit/s) 21 21 21
UMTS Yes Yes Yes
GSM Radio
850 Yes Yes Yes
900 Yes Yes Yes
1800 Yes Yes Yes
1900 Yes Yes Yes
UMTS Radio
850 Yes Yes
900 Yes Yes Yes
1700 Yes
1900 Yes Yes
2100 Yes Yes
Multimedia
Bluetooth with Stereo-Audio-Streaming Yes Maybe Yes
Camera - back (Mpixels) 8 5 8
Camera - front (Mpixels) 2 1.3 2
Video recording 1080p 1080p 1080p
DLNA Yes Yes Yes
HDMI MHL MHL MHL

If you think that something is inaccurate, or there is another aspect which may be interesting, please let me know.