WLADIMIR80  This is definitely the best project management software on the mac. Especially if you work in a windows environment where MS Project is used this is a way to stay on the Mac. Exchange with Project runs quite smooth in most cases.

The Software ist relatively easy to use and is very well integrated with MacOS X. And the price tag is low in comparison to many other software.

Still waiting for a network version but there will one ion the next months as the developers have mentioned in the past.  
(Version 2.0.4)

WLADIMIR80  This is at last the only real competitor to X-Lite... and its working quite well, if you use version 1.2. In the past I had a lot of trouble with the sound but that has been solved, at least for me.

The dealbreaker here ist the price and to some extent the design, what is simply stolen from Apple (just have a look to the isoftphone website...). Not very clever. Next one is the price as I can buy a complete voip-phone for 75 Euros. For under 50 Euros I would think about buying a license. At the moment I am just watching the next steps in development...  
(Version 1.2030)