Cool command-line trick for finding and deleting bogus files.
Packet sniffing is one of the best ways to analyze network problems. Unfortunately, doing this on a switched network can be a bit tricky.
How to see if you are hitting the limit for number of services on a server.
very slow browsing on certain websites when using IE7 Very Slow Copying Over the Network Easpecially when you copy over from your computer to a network shared folder
A useful tool for dumping groups and membership info.