Miamix, I use a number of sources.
My main interest is in selcals, but I'm also very interested in delivery/interesting ferry flights, particularly across the Atlantic and Pacific.
I use AirNav Live Flight Tracker v.3 which is okay-ish, Aeroseek as back-up where ANLFT3 doesn't list the destinations or aircraft types and FBOweb for the biz.
Additionally, I have a number of 'inside' contacts in New Zealand and also a number of same in the UK and parts of the continent who pass along interesting movements/flight-plans to me.
I work away from home quite a bit so there's a lot I miss but I'll happily pass along anything of interest when I am here.