Have a Support Portal instead of email so you are able to monitor and lookup status as well as view previous tickets. In addition, it would be helpful to be able to tag others to view and monitor within the portal
Email support is HUGE. We always have email open in the background. In three clicks I can send a rich text ticket, with images and attachments directly to support@somecomapny.com is universal. These tickets can easily be filtered against exact email addresses (assigned licenses) or domains.
Web based forms however are a PITA. Having to log in, find the page if it isn't bookmarked, go through all the pulldowns- wasting 5 minutes on an email to report a bug, or request a feature, or moreso to request support for an issue new users may not be able to categorize in the pulldowns on the ticket!