Was surfing through the English page of Gundam.info (official Gundam site) and saw the announcement for free viewing of Gundam Wing episodes online, the catch is that its for a limited time only.
Aside from that I noticed that there seems to be a slew of other Gundam episodes posted at youtube, such as Mobile Suit Gundam, Z Gundam, Gundam 00 season 1 and Gundam 00 season 2.
Sadly these videos were blocked for viewing by the uploader from my region of the world so I have no way to check how it is. Maybe you have better luck in your parts of the world and will be able to view it.
