I have dabbled in a few VM softwares recently and have enjoyed a few of them and would to know what is the best VM software to run a lot of different OS's. Which VM runs the most OS's?

Also, what is the Industry standard? I know Novell and Cisco use VM's for work, actually a lot of companies use VM's. What is the industry standard in regards to VM's?

Any recommendations? I have VMware and it is ok. I used the Vista VM as well. I have windows 95 and 98 (just for fun!) running and I have three Linux's running (ubuntu, Mint and Suse), I would like to run 3.1 and some others. I also have XP pro running on my vista, but I think I will flip that. As XP is a hell of a lot more stable. Any good VM's out there I could buy and or just try out? Would love some input.