I'm not yet sure if I'm going to enable the User List on my site, but I'm almost certain I wouldn't leave the link on the main menu like it is now.
Scream was talking about needing space up there for some new features, and I have a few of my own that I plan on adding to the menu. I'm thinking I might create a link to the user list where "5907 Registered User(s)" currently is. It seems like a natural spot for it, and it'll free up some menu space in the process.
Even if Scream keeps the User List link where it is, it might make sense to add it in the above mentioned location as well.
Just a thought...