Flight Planning
Try aeroplanner.com superb planning tool, you can log all your plans and then simply and semi auto update them for weather on the day. Notams included too. Terrain sections, airport diagrams for taxying and a gas price facility not that it maters too much if you are used to UK prices. Downloadable charts for the GPS and a superb "triptick" functions that gives you a PDF file of A4 colour prints of the route overlaid on a sectional that is always up to date. Good quality colour laser printer means you don't even have to buy the paper chart - although I am not sure about the legality. It will also do IFR depaartures and approaches if you are that way enabled
I never go to the US without it and find the subscription really good value for the costs of a couple of charts and a directory.
(No commercial connection by the way -only a v satisfied user)