I logged in today to look for your website.
Not to harsh on the newb too much, but there are tons of options, and you weren't too specific. Cupholders, already addressed. Scanguage to monitor what's really going on with your truck. Also, it all depends what you want to do with it. Camping, offroad beater, creampuff...
@Rusty Marlin mentioned a few good ones, all have been very practical for me:
CDL button
(w/Pin 7 mod I suppose)
Manual Throttle
I'm really interested in this one:
"Dual thermometer read out"