Ok, there are so many of them out there but I manage to compile a few of the best ones that I like.
Blizzard 2009 April Fool
Blizzard’s April Fool jokes are always high quality ones. It includes great artwork and also trailers/videos as if they are so real!
The Terra Tron unit in the upcoming Starcraft II
and More:
World of Warcraft PvP Dance Battle System
Diablo III new class: The Archivist
Google 2009 April Fool
There are a few April fools from almost every Google’s divisions.
Google Australia’s GBall for the sport fans
Don’t have time replying all of your emails? Then try Gmail AutoPilot
Google Chrome in 3D mode. Browsing can never be the same! 
Google YouTube new viewing experience. No, it’s not in 3D. To enable it, add &flip=1 to your videos (may not work with all videos).
My video, upside-down (yeah, that was me in our 2008 Christmas play celebration video)
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Or how about a real life April fool’s joke in Japan where over two thousand people were lining up for a game release that never happened?
But nothing can beat my favorite from last year: The flying penguins April fool’s joke from BBC in year 2008:
{ 18 comments… read them below or add one }
That was pretty nice jokes. But, when you are the one who experience it, like lining up in a long long line waiting for something to be given or released, and in the end, you got nothing, sighs, its annoying hehe.
Tnomeralc Web Design Toys´s last blog post..Tejeros Convention In General Trias
Eh? Seriously over 2000ppl lining up there? Whoa, it’s a very successful April fool.
Wiehanne´s last blog post..Hello April
hey gud ones.. i read the japanese game release one… rofl seriously
you missed techtola’s amazing april fool prank.. lol just kidding
http://www.techtola.com/2009/04/late-april-fool-computer-prank.html
Quakeboy´s last blog post..A Late April fool computer prank
Some great ones this year. My favorite was probably Reddit who basically changed each section of their site to look like a different competitor.
Jodeci´s last blog post..Chasing the Dream: The Case Story
You mean to Digg? Should have just said it
Michael, it wasn’t just digg though. For instance, going to their science page featured a page that looked like slashdot, their photos section like flickr.
It was literally EVERY section of the site was modelled off of a different competitor. That shows a lot of work!
Jodeci´s last blog post..Chasing the Dream: The Case Story
Great April fools – most of blogs
Gry dla Dzieci´s last blog post..Mrówki!
I like the Youtube idea of Upside down video, really funny.
Shanker Bakshi´s last blog post..Twitter Office
You can still turn the youtube videos upside down if you change the url.
Megaphase.info´s last blog post..PHP Multiple Password Generation
i really impressed by You tube idea. they gave handsome entertainment.
Haha, nice finds. I missed the penguin one from last year but thoroughly enjoyed watching it here.
Even I played a prank and to my surprise many bloggers fall for the prank
http://www.shoutmeloud.com/sold-shoutmeloudcom-for-8000-to-socialtechinclusive.html
Harsh Agrawal´s last blog post..Comfy magazine style template for blogspot || Blogspot theme
jajaja very funny all!!!
Indeed some great ones this year…though yea the BBC one was brilliant last time!
Don
That one was the best ^^
I love Blizzards again this year. They always put a ton of work into their april fools jokes and they’re always a good laugh. Them and Google have april fools day on lock down
Jodeci´s last blog post..Chasing the Dream: The Case Story
Hey!
It sounds so funny so huh, I did not check all of them , I am gong to try it soon, I think they will be good joke the next April Fool’s day, I love them so much because they brought a sense of happiness. so I am going to recommend it with my other friends. Thanks for offering them.
Sanya´s last blog post..Photo Hohhot Xilituzhao Palace12
Ahh, I didn’t notice that. I rarely spend my time on Digg