Why jailbreak? Demo by @saurik
Reasons to jailbreak by @saurik, interview by @Scobleizer of http://www.building43.com
Names of tweaks (thanks dreamyshade!).....
Five Icon Dock - five icon dock
Barrel - the animation when sliding between screens of apps
SBSettings (with the theme Serious SBSettings HD) - drop-down settings
qTweeter - drop-down Twitter client (also works for Facebook)
Voicemail Forwarder - send voicemail as email attachments
Graviboard - shake to make the icons loose
Lock Calendar - simple lockscreen calendar
CUPS HD - winterboard theme
Color Keyboard - black keyboards on 4.3