I think it's really stupid for companies to change their name.  Cingular no longer exists.  They informed people of this by generating the slogan, "Cingular, the new AT&T".  People scratched their heads and said, "So wait, is it Cingular or is it AT&T?  Cingular is the new AT&T, meaning AT&T no longer exists?  I don't get it."  So Cingular changed their slogan to "AT&T, formerly Cingular Wireless".  That clears it up, but it's still stupid.  Why did Cingular buy AT&T, eliminate the AT&T brand, and then change its name from Cingular to AT&T?  It causes confusion and hopefully eliminates customers. 

I know a person who works for M&M Mars.  Every single person on this planet knows what M&M's are, so it's smart to include that word in the title of your company.  But no, M&M Mars changed its name to Masterfoods, because, ya know, it's more recognizable.  Word on the street is that they're changing their name back to M&M Mars because everybody got sick of saying, "Yeah I work for Masterfoods ... ya know ... the people who make M&M's."  The people who make these decisions must be painfully stupid.  I hope they get fired. #business