I got a Mac Mini(DVI) and a laptop(VGA) sharing same LCD monitor. When using Mac, I need to unplug VGA on the monitor and plug DVI back, vise versa. It's inconvenient to plug/unplug the cable on the back of monitor. Is there any way to make this process easier like some kind of switch?
What type of monitor do you have?
One of the main reasons I bought my Dell display is that it has both DVI and VGA inputs. I just plug each computer into one of the inputs, and the button on the front of the display switches between the two (it's also got S-Video, composite, and component, although I've never needed those).
Any chance yours has any additional inputs besides DVI?
A KVM switch perhaps? You can use a VGA to DVI adapter with this switch and it will work fine. I have 2 of these (the 4 port versions actually) and they work great.
Here is an even better KVM solution for your purpose since you are using laptops. This KVM switch has a push button for machine selection so you wouldn't need to plug any keyboard into it at all.