Android : Way To Clear Gmail Notifications When No New Emails?

SItuation: I'm at work, sitting at my desk when an email arrives in my gmail account. My nexus one buzzes and the trackball glows with a notification. At the same time, my google talk client notifies me that I have a new gmail message, so I figure the phone notification is for that email. I check the email via gmail on my desktop and I now have no new emails, but the notification on my phone remains. Is there anyway to have this notification disappear once I've checked the email anywhere except the android gmail application? I have the same problem with my work email with the email client, too, and it's a little annoying.