If you love to discover Google’s special logos (doodles), and were expecting a doodle on Saint Valentine’s Day this year – don’t disappoint. Of course, there is no doodle on Valentine’s day this year, Google has changed the alt-tag of its logo to wish you a happy V-day.

Currently, Google.com is showing up special doodle series on Vancouver 2010. To see the above message, place your mouse on the logo. This V-day tweak is visible only in US. Users from other countries can use any US proxy site to view this.
Orkut.com is displaying a special logo on the V-day:

Also check: Will you be my valentine? on WolframAlpha :)
Read More Articles:

Update: YouTube has a special logo too. (only for US visitors)
http://s.ytimg.com/yt/img/logo-valentines2010-vfl145896.png
I am not impressed with the vancouver doodle by google.. Its sobre and lifeless… Could have been vibrant and attractive :(