The Android Site

HTC has a new ROM upgrade for your Hero. Version 2.73.405.5 is up now at the HTC UK site, for owners of Orange, T-mobile, and other UK Hero users. To upgrade, head over to the HTC support page for full instructions on installing the new firmware.

The update will speed things up a bit for a snappier experience and touch-to-focus for the your 5MP camera. And unlike other software upgrades for Android phones, you will need a Windows PC to install the update, sorry Mac and Linux users.
[thanks to @burrom for the tip]