http://www.zoho.com is the one I have been using recently, but unfortunately I don't have much experience with Salesforce to make a proper comparison.

For those dealing with multiple services, I recommend taking a look at Zapier (zapier.com) for automating data exchange between *aaS providers.

15:00 São Paulo (Summer Time). Here's an updated TZ list http://everytimezone.com/#2013-10-22,300,6bj

Today is the first time in months that I've searched for an international timetracker. Was really impressed with this:

http://www.worldtimebuddy.com/est-to-cet-converter

Finally, a website with a very clear visualization of various timezones.

Then you post evertimezone.com, which does a very similar thing, but with battery-friendly css :)

I'm a big fan of http://time.is. You can go to http://time.is/compare to generate a similar comparison, or just add the times you want to know to the front page.

What I like about everytimezone is that a single access provides all information I need, no interaction required.

As for the design, I appreciate the work of Amy Hoy. She also did a great job with their time tracking app: letsfreckle.com