Downloads

Apple

Apple Firmware Downloads - Sites hosting historical and current versions of Apple firmware for iPod / iPhone / iPod Touch / iPad / Apple TV.

Link 1 - felixbruns.de
Link 2 - ipswdownloader.com
Link 3 - isoindex.com
Link 4 - ipsw.me

Microsoft

Windows 7 - Burnable ISOs for Windows 7. Multiple versions and languages. Valid keys are required as these are simply links to Digital River, Microsoft's hosting provider.

Office 2010 - Burnable ISOs and installable EXEs for Office 2010. Multiple versions and languages. Valid keys are required as these are simply links to Digital River, Microsoft's hosting provider.

Networking

Wireshark Extended MAC OUI List | IEEE MAC OUI Search - MAC address vendor search and listings

Software

"How do I create an .iso image?" - MacRumors forum post showing how to use Disk Utility and hdiutil to create ISO9660 compliant ISOs in OS X

Web Design and Web Tools

Web Safe Color Codes - a chart of all 216 of them

WhatTheFont - upload an image file or specify a URL to get the name of a font

Jeffrey's EXIF Viewer - a nice web-based EXIF viewer

Devoth's HEX 2 RGBA Color Calculator - easily convert Hex vales to RGB/RGBA for CSS

Namechk - see if a certain username or custom URL name is available at over 150 websites in one spot