I came across the following document the other day that contains plenty of useful tuning parameters and settings that you can tweak in order to improve performance in Windows Server 2008. The nice thing is that each setting and its effect (or side-effect) are explained so that you can decide if you want to make the change or not, or whether it is even relevant to your particular system.
The document is especially useful if, like me, you run Windows Server 2008 on a laptop as your main, and only, operating system. I am still going through the document (it is rather large at 78 pages) so it will be a while before I make many changes to my system, but if I do find some gems that really are worth discussing then I’ll post them individually here!
The document can be found at this page: http://www.microsoft.com/whdc/system/sysperf/Perf_tun_srv.mspx