Lexar tool makes creating bootable USB flash drives easy
BootIt doesn't handle partitioning duties, so you'll need to do that first. After that, making your drive bootable is just a couple of clicks away. Enter a volume label, flip the removable bit if you're using multiple partitions, mark your active partition, and you should be good to go.
Keep in mind that this utility is designed for Lexar drives, so it may not work with any old flash drive. I had success with both my Kingston and Transcend drives, though.
[ via ShellEx City]