Just thought I'd post about this as I'm sure there are a few people here with a multi-display setup who'd be interested.
NVIDIA possibly with the last driver update or the current one have upgraded NVIDIA surround in a few significant ways.
1. With an SLI setup you can now use three display ports on your first card such as both Dual-Link DVI's and a Display Port. Previously you had to have two displays on the first card and another display on the 2nd card which meant when Surround was disabled you couldn't use all three screens as just a normal extended desktop with SLI enabled.
2. NVIDIA's desktop toolkit for Surround now functions in Windows 8/8.1 so instead of having a task bar that spans across all three displays it is only on the centre panel. Similar situation with application windows, when you maximise them they maximise only to the display the window is in instead of going across all three displays. Previously these features only worked on Windows 7.
3. NVIDIA Surround now supports G-Sync displays so you can use three of those in a surround setup of course you need three Display Port connectors for this such as the ones included on the GTX 980 as G-Sync is currently a Display Port only implementation.
4. You can now use surround mode with only two displays. This is mostly for 4K panels that use two separate displays combined in to one larger panel but you could use it with two normal displays perhaps you have some with ultrathin or even invisible bezels or perhaps you're using two projectors!
So these are the changes I've found so far. Overall it works a lot better than it used to. I stopped using surround for a while due to needing to constantly reconnect displays to different ports to get it functioning for games but they've fixed that and I'm using it again.
Hope some others find it interesting ^_^
NVIDIA possibly with the last driver update or the current one have upgraded NVIDIA surround in a few significant ways.
1. With an SLI setup you can now use three display ports on your first card such as both Dual-Link DVI's and a Display Port. Previously you had to have two displays on the first card and another display on the 2nd card which meant when Surround was disabled you couldn't use all three screens as just a normal extended desktop with SLI enabled.
2. NVIDIA's desktop toolkit for Surround now functions in Windows 8/8.1 so instead of having a task bar that spans across all three displays it is only on the centre panel. Similar situation with application windows, when you maximise them they maximise only to the display the window is in instead of going across all three displays. Previously these features only worked on Windows 7.
3. NVIDIA Surround now supports G-Sync displays so you can use three of those in a surround setup of course you need three Display Port connectors for this such as the ones included on the GTX 980 as G-Sync is currently a Display Port only implementation.
4. You can now use surround mode with only two displays. This is mostly for 4K panels that use two separate displays combined in to one larger panel but you could use it with two normal displays perhaps you have some with ultrathin or even invisible bezels or perhaps you're using two projectors!

So these are the changes I've found so far. Overall it works a lot better than it used to. I stopped using surround for a while due to needing to constantly reconnect displays to different ports to get it functioning for games but they've fixed that and I'm using it again.
Hope some others find it interesting ^_^