Fltplan.com has a mobile version of their website. I use it for flight planning, weather and to file flight plans when I am away from home. Also use AirWX Mobile for quick station weather. Both are FREE
In case you need it, here's the Wingx website.I purchased Wingx before the AOPA free version was released. The Wings AF/D has more information than the AOPA version along with all the plates. FWIW. The blackberry version of WingsX does not do flight planning yet.
I like the web site http://picbrief.com it does not require a log in to get info on an airport, navaid or a flight plan.