They look better. It's worth the extra expense. The exception to this rule is sending a letter to a box number listed in the paper. The mail slot for these is business envelope size. If you send your information in a large envelope, it will be bent and crushed to fit into that slot.
Some people send their resumes and cover letters by overnight mail or registered mail.
Faxing is an option, too. The lower quality of the copy can be a disadvantage, though. Check with the employer before you fax. Similarly with e-mail, only use this option if the employer requests it. Return to Career Services Homepage.