Ok, let’s see now. So far I’ve seen:
* Google is pretty much playing it straight… except their search requests also include a link to their Jobs page - ‘We’re Hiring Autocompleters!’
*YouTube is apparently celebrating 100 years, with a few vintage clips, and different logo.
* The Team Fortress 2 wiki has a very convincing page explaining that the wooden cow cutouts will now be melee weapons for the Heavy.
* Minecraft has in-game ‘locked crates’ parodying the MannCo crates in Team Fortress. When clicked on, they lead to a bogus ‘items for sale’ site, with things like Creeper Saddles and Response From Support.
* Kingdom of Loathing has some pretty epic April Fool’s content - Fighting the butts of the various dev team, a trophy that can only be achieved if you have less than 10,000 Meat (trophies cost 10K Meat to activate…), and the actual, legitimate return of the Spectral Pickle Factory.