I think the best one I've found was the xkcd 3-D conversion. The rest seem to suck. Google has the fake GMail move or whatever they called it. Youtube has a video celebrating 100 years. SFN has probably the worst with Cap'n's lame sense of humor.

a better google one http://www.google.co.uk/intl/en/landing/translateforanimals/

 

And of course Think Geek has their thing going on a couple are kinda funny. There's one somewhere about a unicorn fossil being found.

I liked the flying penguins the BBC did a few years back.

Google was advertising for autocompleters. I thought that was funny.

I think it was last year Science said they were merging with Nature. That was a pretty good one.

 

[edit]

Just found another one I found funny

http://www.jastusa.com/hentai-games-make-their-steam-debut

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Edited April 1, 201114 yr by Ringer

Wiki main page has the ghost of cock alley doing some fanny stretching.

Didn't Google claim to have changed it's name to "Kansas" one year?

http://www.wolframalpha.com/bieberbeta.html

 

This was wolfram's

SFN had me fooled for about a couple of seconds by giving me a two-star Administrator logo. Those two seconds were flattering though.