I haven't been able to test it, but looking at your site I think I have one cool direction for future work:
You might consider adding something like what vmware does between the physical and virtual machines with vmware aditions. I can see lots of uses for clipboard sharing and file drag+drop between physical machines controlled with the same keyboard
A few more remarks, now about the site:
1 - It's a matter of preference, but I think the site looks much better when I put the mouse over the menu on the left, in my opinion it should always be like that.
2 - It is not clear on the site that the software is shareware, I couldn't find a link to the shop anywhere except in the FAQ, which seems strange.
3 - I am assuming the trial version has some kind of time limit, I believe it should be stated somewhere in the download page.
4 - From reading the "work with a co-worker" scenario, I assume that the mouse works in a similar way to your multimouse
, where you get multiple cursors in the same screen when you move to a different screen. If so, I think this much better than taking control of the other mouse (which was what I assumed first) and you probably would be better served by emphasizing it a bit more.