If your verification file or meta tag is still present on your site,
try clicking the "pending" link on the My Sites page and then clicking
the "Verify" button on the Verify page. We reverify periodically and
generally this is done in the background -- we find the file or meta
tag and the site remains verified. However, every so often, this
reverification process is pending, and clicking the Verify button
requests the reverification check right away.

If this doesn't work, please post back with your site URL so we can
check into it.