Please verify that:

 * Your bug doesn't already have a ticket
 * That your bug is not already fixed in current SVN
 * That this is really a bug, and not a feature request.

If this is a compiling problem, e-mail the users list, then the developer list before adding a ticket. These are often caused by toolchain or dependency problems. Of course, if the problem is only present after a particular recent commit, e-mail the developer list immediately.

Once you've decided to create a ticket:
 * Make sure to assign it to the GoToDev for the broken component.
 * Make sure you attach logs, patches, and backtraces after you create the ticket.
 * If problem causes a SEGFAULT, attach the backtrace to the ticket.

Tickets are generally not addressed as quickly as e-mails to the developer list, but they ensure that the problem doesn't get completely lost in the noise.