Experimenting around I found that like Spacebar, Return will Play/Resume playback but what's more, is that if you hit Shift + Return (Control + Spacebar works also) you'll see Netflix switch to it's thumbnail fast forward rewind interface and even more the Left and Right Arrow Keys will advance and rewind the video (thumbnails) by 10 seconds at a time. Hitting Return will start playback at the new location.
Yeah yeah, not a Final Cut Studio tip but I did stumble upon it (literally) and it was pretty handy to find certain frames that the client wanted to show me.
Some other interesting things you can do in Netflix.
1. Right Click on a streaming video and select "Silverlight Preferences": lots of stuff to monkey with here. This only seems to work when NOT in full screen mode.
This actually launches a small app located at: /Library/Internet Plug-Ins/Silverlight.plugin/Contents/Resources/Silverlight Preferences
2. I couldn't get it to work on a Mac but apparently you can hold down SHIFT and Right-Click on a Windows machine to bring up a secret debug menu.
3. Diagnostics Menu: Shift + Control + Option + M brings up the hidden diagnostics menu. Again, this works when not in full screen mode.
A: Shift + Control + Option + S = Stream Menu
B: Shift + Control + Option + D = A/V Stats
C: Shift + Control + Option + L = Logging Window
D: Shift + Control + Option + P = Player Info Window
E: Shift + Control + Option + C = Frame Rate + Mysterious Numbers. Green Controls. (Hit this in not full screen mode [windowed mode I guess?] then drop into full screen mode.)