Not sure if these have been posted earlier, but here goes anyway. I was browsing the the Google Play store and came across a few Android apps. for control of various devices from the respective manufacturers. I've installed some of these on my Nexus 7, but haven't tried them out as yet. Here are the links:
1. Sony (HX-850 ......)
TV SideView for Tablet: Remote by Sony
TV SideView: Remote by Sony
Sony Media Remote for Tablet
Sony Media Remote for Android
2. Panasonic (DMP-BDT220 .....)
Panasonic Blu-ray Remote 2012
3. Pioneer (N50 .....)
Pioneer ControlApp
1. Sony (HX-850 ......)
TV SideView for Tablet: Remote by Sony
TV SideView: Remote by Sony
Sony Media Remote for Tablet
Sony Media Remote for Android
2. Panasonic (DMP-BDT220 .....)
Panasonic Blu-ray Remote 2012
3. Pioneer (N50 .....)
Pioneer ControlApp