Can I have the latest version of VMWare Player with the latest version of VirtualBox installed side-by-side on the same machine on Windows 7?
Are there any conflicts? AFAIK, they both create virtual network adapters, etc.
Since they both create their own version of virtual network adapters, there should not be any conflicts from that, no.
Rather, think of any potentially shared resources, and direct hardware access to, for instance, USB or video.
You will have problems with those.