TimeZonesMenuBar download

It helps you track current time and time zone information for multiple cities.
Counter
Download from the developer's website

Additional links

Purchase at itunes.apple.com for
$1.99

Alternative apps

World Clock Deluxe
World Clock Deluxe
rating

It can display multiple clocks in a horizontal or vertical palette...

The Clock
The Clock
rating

Facilitates communication and collaboration across time zones.

Yam Display
Yam Display
Free
rating

It turns your iPad or iPhone into an external monitor for your Mac via USB.

IP Address Menu
IP Address Menu
rating

IP Address Menu lets users display a current IP address in the menu bar.

Second Time
Second Time
Free
rating

Extra clock or “Second” clock for your Status Bar.