Im always being asked how can we tell if our SIMs server is working properly and determining/tuning SQL performance is quite an art in itself but the chaps at ManageEngine have put together a pretty slick tool for free thats worth a try if only to satisfy your curiosity that all that money your LA charged you for your SIMS box was worth it..
Free MS SQL performance monitoring Tool, Monitor MS SQL 2005, MS SQL 2008 server with Free SQL Health Monitor
The Free Hyper-V Monitor is pretty good too but only lets you have 2 Host servers which is not a lot of use if you need to monitor a 3 node cluster from afar :(

