We are using Youtrack since two months, and we are really satisfied! But we have also an issue we cannot imaging other people don't have.
For our (software development)products, most of the times the Unresolved issues are most important. But now we have to type manually "#unresolved" or create for every project a Saved Search to the unresolved projects. Isn't there a better solutions for that? For example a simple button which removes all resolved issues from the current list? Or even better; by default only show open issues and make a button to show the resolved issues. Like you do with Google Reader?