I've now got round to uploading it to the Nokia Store: http://store.ovi.com/content/247839
It's certainly worth making use of the Nokia Store for anyone writing Qt software for Symbian - I'm now at 690,000 downloads since 25 January 2012! (I'm just kicking myself for not putting it on there sooner...)
I've also ported it to Android ( https://play.google.com/store/apps/details?id=net.sourceforge.wifiremoteplay ), making use of the unofficial Qt port for Android (Necessitas). (Interestingly, the downloads on Android, comparing the first week for each platform, are over 200 times smaller...)
And I've added support for VLC too.