You mean like Napster?
While it would nice for Windoze Weenies to be able to play their WMA's on their iPods, they should wake up and ditch Microsoft already.
WMA stands for Windows Media Audio and is only one, proprietary format by Microsoft. Despite their claims, it is lower quality than QT-based, open standards like MPG, usually with a larger file size.
2.5 GHz MacBook Pro Core 2 Duo, 4 GB RAM, 320 GB hard drive, runs 10.6.8
1.6 GHz iMac G5, 1.5 GB RAM, 120 GB hard drive, runs 10.4.11 (out of commission)
iPhone 4, 16 GB, iOS 4.3.5