Most of the issues I had really had to do with not having "Automatic Graphic Switching" unchecked prior to install. Once I regained control, I uninstalled the driver, rebooted, unchecked graphic switching, rebooted, then reinstalled the Displaylink driver. Everything worked fine after that, even having my external monitor be my main display & dock.
One thing I discovered is that using a USB graphics adapter for both my external monitors ensured that the computer will always go to sleep once the lid closes on my MBP. I ended up using the mini display port for one of the monitors so I could keep the lid closed and continue using the computer. It's not a bug with displaylink, just a Mac issue on these new mid-2010 Macbook Pros (unibody).
I wrote some details on my blog about it
http://cfdad.com/2010/10/20/macbook-...iple-monitors/