Gerald,
Have been told about this site which is also a good one;
http://radar.piopawlu.net/
It is on Google Earth maps which are nicely detailed maps and mainly has feeds from European countries from Norway, Sweden, Finland down through Poland, Romania, Czech Republic and the likes.
No coverage it seems over France, Germany or UK, but I have been tracking VH-OJN over Poland operating QF9 and also VH-OJD is cruising over Czech Rep at the moment as well.
The maps only work with Mozilla Firefox and not with Internet Explorer. It will still work in IE only you will have a black background.
You just have to register, but it is free.
Cheers,
Dave.