On my list would be the artist Prince, who changed his name to an unpronounceable symbol, which was (and still is) not part of Unicode so newspapers weren't able to print it. We ended up with "The Artist Formerly Known as Prince" for 7 years. He changed his name back. Maybe there's hope for Twitter, too.
How about these...<p><pre><code> Netflix->Qwikster
Radio Shack->The Shack
Homegrocer->Webvan
Yummy.com->Kozmo.com
Bokus.com->Boo.com
Broadcast.com->Yahoo! Broadcast Services</code></pre>
Twitter was a product I saw no need for to begin with. I think the brain dead management decisions he made going in had a bigger impact than the brain dead branding seemingly done by a terrible agency or one that was just staffed with yes men (same difference). I am more than mildly disturbed that it hasn't gone completely under yet. The fact that so many poor quality name brands can underproduce and stay viable has clearly shaken any faith i had in market balancing or other tenets of Capitalism, leaving me certain we live in hell.