If you're a tech or ever do any kind of tech type work you'll probably love this list of online tools.

There are links to fifteen online tool sites that will help you with things such as looking up IP address information, checking spam databases, runing pings, runing traceroutes, looking up WHOIS information, finding and sharing logins for sites that require you to register, testing internet connection speeds, online storage service that allows you to upload large files, access them from any computer, and share them with other people, create temporary email addresses that expire after 10 minutes, generate free, secure passwords, running a virus, spyware, and malware scanner from your browser, helping you to check which ports are open into your network, helping you to identify unknown files on a computer, helping you to send large files to other people when the files are too large for your email, finding and downloading DLL files, searching Microsoft related sites, converting over 60 different types of files with one online tool, and helping you to search for router as well as other devices default passwords.

This list has it all! Very useful.