Over here you will find free vector brand logos in Illustrator, EPS, Corel Draw format..

Brand Vector Logos start with 'X' letter

Xplod(34)
Xplod(33)
Xplod(32)
XPlay
Xpherix
Xpherix(31)
Xpherix(30)
Xpherix(29)
Xpertbuyer
Xpert
Xpert(28)