- Keyboards -
I hooked up my Logitech Unifying K400 via USB and it works. Of course the problem is that's meant as a traditional PC keyboard/touchpad and doesn't have a dedicated directional pad, etc. Using the arrows doesn't work, so unless there are some hotkeys I'm not aware of to simulate it, you can't actually move around the UI, click enter, etc. It's purely for entering in text once you've selected a text box using the remote.
This weekend I'm going to test my Logitech Unifying K700 (keyboard that shipped with the Revue). I'll have to hook up the receiver from my K400 to my PC and instead pair it to the K700. Hopefully this won't hose up the dedicated pairing to the Revue and will instead work for both. Assuming it does work for both though, it will be interesting to see how easy it is to separately control the devices. I don't want to power them both on

The other thing I'll be testing is a USB hub. My hope is that I can have both the keyboard receiver and a thumbdrive hooked up at the same time. A secondary test I'm going to do is see what happens if I then hook up a second thumbdrive with media on it. What I want to see is, first, does it work ... and second, will the player know to default to the 1st thumbdrive when storing bookmarks, etc. Obviously one wouldn't want bookmarks, BD-Live data, Gracenote info, etc. spread across multiple thumbdrives.
- Secondary HDMI Output -
I decided to do a test by using
this HDMI->VGA converter I ordered on ebay.
When I hooked up the tiny old Dell LCD I had, I got an unsupported format message on the screen. It seems the converter can't figure out really low-res monitors (1024x768) and send the right EDID info to force the 790 to output 480p? Hard to diagnose without the right equipment.
No matter, I also had an old Samsung SyncMaster 914v laying around (1280x1024) and that worked great. Well ... mostly. There's a few things you'll need to consider. First off, if you have the 790 set to 16:9, hooking up to a 4:3 monitor means your content will be stretched. So unless you want to keep switching the aspect ratio in the settings, be aware that you'll want both displays to have the same configuration. For me personally, that's not a problem at all since the only reason I'm using the monitor is as a head when streaming audio. Having stretched graphics on Pandora is obviously something I can live with if it means I'm not constantly turning on my 60 SXRD just to listen to music. It's a small price to pay

The second 'issue' is slightly more annoying, though I believe I have a workaround. The HDMI outputs are synched together such that they both want to output the same resolution and bit-depth. Which means it will drop down to the best that the lesser display supports. So in my case if I turn on my TV in this configuration, it will receive 720p ... and amazing, 20-bit color (what the heck is that? 7/7/6???

). Regardless I figured as long as I turned off the monitor it would switch back? Unfortunately no. Then I figured maybe if I reset the 790? No. Reset my video processor (effectively the same as resetting the TV)? No. Unplug power to the monitor or disconnect the VGA? No.
Unless I've missed a permutation, what I've deduced is that the 2nd HDMI output is actually still sending power to the converter and therefore syncing to it even though no display is connected ... and apparently it has memory of its last setting. If you actually disconnect the converter from the 790's 2nd HDMI output, it will automatically hot-sync to whatever the capability is of the main display (in my case, 1080p / 36-bit color). My planned work around is to get a longish HDMI extender cable and the shortest VGA cable I can find. That way I can easy disconnect the converter's HDMI input from the monitor side instead of having to go behind my AV cabinet to disconnect it from the back of the 790 (which is obviously
far from optimal). Certainly a bit of a kluge, but it's worth it to get the capability of a 'free' secondary display for audio. Maybe I should have ordered the black version to match my monitor since it may be harder to hide now

I'll update my testing once I get the hub, extender cables, etc.