Code your GUI like Skype
Trolltech's Qt (pronounced cutey) is one of the programming tools Skype used to be so cool, and so cross-platform. In addition to Windows, Mac, and Linux, their Qtopia is used in some embedded devices, like the Sony Mylo.
Here's a slide show overview.
Check out the QtCenter.org developer community. You can talk with Trolltech at 3GSM Barcelona this week and the ETel - Emerging Telephony Conference Skype Journal co-sponsors.
