PerfWiz with the PAL tool
If you have ever wanted to have a look at the Performance of your Exchange Server, any version, then this is the post for you 
Using PerfWiz you can easily configure a Performance Monitor counter to take a snapshot of your server over a given period of time, the best part is it uses a wizard to capture the counters that mean the most to a Windows Server/Exchange Server so you do not have to be a PerfMon genius. Then using the PAL tool you can analyze the .blg file that the PefWiz counter creates and get a nice report with graphs to review and diagnose or build baselines of your Exchange Server. The report even explains what the counters mean and what you should be looking for. You install the PerfWiz on your Exchange Server (quick and easy install, no reboot required) and PAL on any workstation, there are some pre-reqs for the PAL tool so make sure to read through them on the site below.
Keeping an eye on performance trends can be invaluable when trying to justify hardware upgrades or for better tuning of your servers. I am sure you will find this tool combination useful.
PerfWiz - (Exchange 2007) - http://blogs.technet.com/mikelag/archive/2008/05/02/perfwiz-replacement-for-exchange-2007.aspx
PAL - http://pal.codeplex.com/
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