My GA IFR Planning - mostly online
Sporty's Pilot Shop Chart Doctor for my route. I have an ongoing subscription for all IFR/VFR AF/D, Plates for my local area, I just get what I need for the longer trips.
Airnav.com or Aopa.org to get the AF/D info and a nice big PDF of the destination and alternate. I still lug the AF/D around to keep the FAA happy.
DUATS - basically FSS online. Get a route briefing as close to departure as possible.
Call FSS to verify the DUATS breifing (wx, notams) and to get an update from the only FAA approved source on TFRs just prior to departure
I also use RMS' Flightsoft program. Lets you create routes, it knows all the SIDS/STARs, weight and balance for your plane, speeds, downloads wx, creates flight plan - too much other stuff to mention.
HTH -- 73M