06->07:
Added shark fin
Added X package option
Moved gas/trunk buttons slightly and illuminated them
Enabled TRAC button to disable TRAC/VSC
07->08:
Improved steering feel
Added rear legroom due to new shape of front seatbacks
Illuminated scuff plate color changed from blue to white
OEM 18s color changed to liquid graphite
Coinholder added to dash
08->09:
A bunch of facelift changes (some interior trim and color changes, bumpers and tails changed, the ugly turn-signal mirrors are added, and the hideous lobster claws become the standard 18" wheel)
Paddles enabled to work in D
09->10:
Bluetooth now available without nav
Nav system updated to match what Garmin offered in 2006 (as opposed to the 1999 era one in the 06-09 models)
USB port added for ipod interface, SAT radio now built in as well rather than optional
A2DP streaming now possible
10->11:
Another facelift with bumpers and whatnot
Ugly LED headlamps added (which means AFS no longer offered)
Passenger side memory seat no longer available
PCS option no longer available
X package no longer available
Sport package no longer available
F-sport package added
350 now offered with AWD
Source: https://www.clublexus.com/forums/is-2nd-gen-2006-2013/625596-2nd-gen-is-facelift-refresh-what-when-was-it.html#post7108709