You can access the Clock app from the Search button.
1. Press Home button. (Bottom left button)
2. Press Search button (Bottom right button)
3. Type 'Clock' in the search bar
4. Choose the Clock application from the list
(The next time you use search, clock will be at top of list, so you won't need to type it again.)
Using Search can also allow you to directly launch the 'Car Panel', 'Phone', 'Call History', & 'Weather' apps and the new 'Dock Mode' app.
The new Dock Mode app launches automatically with the HTC desktop charger with the new Gingerbread release. It has a neat customizable photo slide show that let's you set which photos you want. It also let's you access the Gallery, Music, Calander, and see the latest time and weather info.