Fring works but its kinda buggy with Skype, maybe to many users, maybe it needs an update but it works ...
I get alot of issues if the person is on gmaill and trying to recieve a call from me using fring as it wont work if the person is on gmail and skype. Also i get message saying the person is busy, but after 3 trys it works ...
Also syncing with skype is very annoying, even after your contacts are imported sometimes people still dont show up (either gtalk is causing issues, or skype)
Fring to fring is really the best option (EVO - EVO)