Mac – Connect Windows 7 Laptop to Mac mini

@Daniel has a good idea with the switch.

However, if you don't need to share keyboards/mice, I recommend getting a monitor with multiple inputs (almost all these days) and just connecting the Lenovo to one and the MacBook Pro to the other. Switch the inputs on the monitor.
The downside of this is that, even if the monitor isn't using the Mac's input, the Mac will think it's connected. So, you may get windows popping up on a nonexistent monitor, and losing your cursor now and then.

As for features: Make sure you get something with a high contrast ratio, and as VESA mount. Even if you don't anticipate mounting it right away, you may well want to later, especially if you share it between multiple machines.

I have much the same setup as you and therefore ran into much the same dilemma, so the following may not answer your question, but it might help!

I began by using Remote Buddy's "Virtual Mouse" function to use my Apple Remote to navigate around Skype using the directional buttons to move the mouse around (once contacts are set up, its mostly moving and clicking). However, I'm the first to admit this is a bit clunky and not exactly ideal. (I realise you're using a Harmony One, as opposed to an Apple Remote, which doesn't appear to be officially supported, but it looks as though its possible to pair it with Remote Buddy).

In the end, I gave in a bought a Logitech diNovo Mini which is good enough for when I need a keyboard and mouse. And you can also use it for some Couch-friendly surfing too :)