We provide live chat on a daily basis, typically for sales and pre-sales inquiries. We do have a department feature which does allow clients to select Technical Support, which are issues that are typically easy resolved which just involves a variable that needs changing here or there. Live Chat, I agree - lets users know that your company does have a 24x7 presence, and is not like virdave stated, watching tickets be blasted to oblivion at /dev/null ;-)