@What -
Some questions/feeback:
#1 - Windows 7 (going 32- or 64-bit?)
#2 - Monitor <- provides the proper description and color management files - not really necessary, unless your type A like me.

#3 - Intel HD Graphics Driver <- no comment
#4 - Intel Turbo Boost Technology Driver <- I hedged here, as well. Appears to be for integrated graphics only. However, may apply to Turbo Boost between i5 cores as part of Intelligent Power Sharing (IPS).
#5 - nVidia Optimus Display Driver <- think you're okay with the one you selected
#6 - UltraNav (Trackpoint + Touchpad) <- we ran into an issue with this driver after connecting to a dock with an old external lenovo kb (w/trackpoint & touchpad). Something fraks the synaptics driver & you loose the unav tabs on the mouse properties. reinstalling resolves the issue.
#7 - UltraNav Utility <- probably not necessary, but I prefer it
#8 - Intel PRO/1000 LAN adapter <- agreed
#9 - Intel Wireless LAN (bg, abg, abgn) <- agreed
#10 - Conexant Audio <- when we installed the nVidia display driver, we also installed their HD audio & avoided the Conextant altogether.
#11 - Power Manager <- I prefer this, as it gives me more control over my consumption
#12 - Power Management Driver <- necessary with #11
#13 - Integrated Camera Driver <- this is for the integrated cam, if you opted for it. I couldn't get it to work without the driver
#14 - Hotkey Features Integration <- hotkeys are Fn+F2, Fn+F3, etc. Not necessary, but nice, IMHO.
BTW - while T400plus is right in that there's no real value in wasting a little space... just KNOWING that there's cr*p on my drive that I don't need/want keeps me up at night.

It's like having something caught in my tooth & not having a piece of floss. Color me OCD.