Nifty tools for windows
Here are a couple useful tools for windows.
XP Remote Desktop client. It's much better than the RDP client that comes with 2000, as it can be maximized.
TamperIE (download). An IE plugin that allows to intercept POSTs and GETs before they occur and gives you a chance to tweak it (change/add POST data). Unfortunately, I couldn't find the product page for this tool. Activate it with scroll lock.
Sysinternals freeware tools. Very useful system tools for Windows, including a process explorer that lists all the open files per process (Process Explorer), a remote process launcher (psexec in PsTools) and more.
Synergy, a cross-platform software KVM, that allows transparent mouse and keyboard sharing across multiple computers.
Update: The TamperIE folks came up with another tool: Fiddler.
"Fiddler is a HTTP Debugging Proxy which logs all HTTP traffic between your computer and the Internet. Fiddler allows you to watch HTTP Traffic, set breakpoints, and "fiddle" with incoming or outgoing data."