If you have an HTC branded device running Windows Mobile 5 and would like to upgrade to Windows Mobile 6, you only have a few days left.
"October 31st is the last day to take advantage of the free upgrade to Windows Mobile® 6. The upgrade link will be removed from HTC’s website at 12:00 pm (noon) GMT on October 31st.Removal of this free upgrade may affect users of the following devices: HTC S621, HTC S620, HTC P4350, HTC P3300, HTC Advantage."