I'm loving my new lemur, though I've had one reoccurring problem with the touchpad. Every now and then it just stops working. I can't really completely narrow down what exactly is causing the failure, except that it often happens when using chrome, though that might just be because I use that the most.
I installed gpointing-device-settings which shows "disable touchpad" NOT checked when the touchpad stops working, and I can tab down to the checkbox, check it and uncheck it to make it start working again.
I'm still rather new to ubuntu and linux, so I'm not entirely sure how to track down the problem.